Zhishang Chemical

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Zhishang Chemical

Maltol CAS 118-71-8

Molecular Formula: C6H6O3

Formula Weight: 126.11

ZSpharmac: Maltol Supplement

Product Name: Maltol
CAS No: 118-71-8
Purity: 99%

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Basic Info

Product Name:Maltol
Other Names:3-Hydroxy-2-Methyl-4H-Pyran-4-One
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Cosmetic Raw Materials
Appearance:Clear Colorless Liquid
EINECS No.:204-271-8
Provide:Maltol MSDS;
Maltol COA

What is Maltol?

Maltol is commonly situated in nature, wheat, barley malt toasting coagulum, and also some fir trees, larch leaves in addition to bark layers have maltol, as well as also the aromatic dropped leaves also include 2% maltol. Maltol can be straight leaked with ethanol and additionally chloroform, yet most of them are generated by fermentation to acquire kojic acid as well as later on chemically manufactured. Ethyl maltol can furthermore be gotten by this technique. Maltol as well as ethyl maltol are broad-spectrum preference synergists and likewise edible preferences. As a secure in addition to credible preservative, they have in fact been determined around the world and also are extensively made use of in various food handling.

Maltol (maltol), likewise called methyl maltol, chemical name 3-hydroxy-2-methyl-γ-pyrone, FEMA No. 2 656, member of the family molecular mass 126.11, white needle crystal or white crystalline powder, Melting point 162 ~ 164 ℃. Maltol is present in fern leaves as well as larch bark, as well as additionally in trace quantities in some food ingredients such as roasted chicory, sugar, baked coffee, chocolate, cereals, and also bread crusts. Maltol is soluble in hot water, ethanol as well as chloroform, 1.5% in cold water at location temperature level, 2% in cozy oil at 90 ° C, as well as insoluble in ether, benzene, as well as oil ether. It sublimates at 90 ° C with a threshold of 0.03%. The liquid treatment of maltol is acidic, as well as also it creates salt in case of antacids, along with transforms purple in case of ferric chloride. It furthermore has really candied fruit aromas and its deteriorate choice has a mild strawberry scent. Under acidic conditions, the scent improvement influence of maltol was far better, with the constant boost of pH value, the aroma gradually deteriorated; under alkaline problems, the fragrance worn-out dramatically. Maltol has a vast application selection as well as no harmful as well as unfavorable effects. It is a secure as well as reliable taste synergist and additionally has a big market in your house as well as abroad.

Maltol Property

Melting point 

160-164 °C(lit.)

Boiling point 

205 °C


1.046 g/mL at 25 °C

refractive index 

n20/D 1.541


198 °F

storage temp. 



methanol: 50 mg/mL, clear






Clear colorless


5.3 (0.5g/l, H2O)

explosive limit


Water Solubility 

1.2 g/100 mL (25 ºC)


Maltol Uses

  1. Maltol is a permitted edible spice specified in GB 2760-1996. Mainly used to prepare strawberry, coffee, malt, nuts, vanilla and various fruit flavors. Used for bread, cakes have freshly baked air.
  2. Maltol is often used in the formulation of daily necessities, but the dosage is very low. For pine needles and roses, it has a warming and sweet effect. Mainly used in edible flavors, such as pineapple, strawberry and other fruit flavors, and generally can be used as a sweetener.
  3. Maltol is a food flavor allowed by my country’s “Hygienic Standards for the Use of Food Additives”. It is mainly used in cakes, chocolate, candy, tobacco and alcohol flavors, and acts as a sweetener and flavor synergist. 90mg/kg in chewing gum; 31mg/kg in candy; 30mg/kg in baked goods; 15mg/kg in jelly; 8.7mg/kg in cold drinks; 7.5mg/kg in puddings; 4.1mg/kg in soft drinks .
  4. Maltol is a broad-spectrum flavor synergist, which has the functions of increasing flavor, solidifying flavor and sweetening. It can be used to formulate edible flavors, tobacco flavors, cosmetic flavors, etc. It has obvious effect in brewing, pharmaceutical and other industries.
  5. Maltol has a caramel aroma and a strawberry aroma in dilute solution. Maltitol is a derivative of γ-pyrone and is mainly used as food flavoring agent, daily necessities and tobacco flavors, photosensitive materials, preservatives and skin care drugs. Adding a trace amount of maltitol to food can not only improve and thicken the aroma, but also prolong the storage period of food without mold. The essence used to prepare daily necessities can also play a good fragrance effect. Maltitol is also an excellent substance for uniform coating of photographic film to prevent spots and streaks. The skin care cosmetic formulated with it has good efficacy of inhibiting the growth of melanin and whitening the skin. It is used in the production of various foods, such as chocolate, candy, canned food, fruit wine, fruit juice, ice cream, biscuits, bread, cakes, coffee, soft drinks and sorbet, etc. The general dosage is about 1/10,000. It has a significant effect on improving and enhancing the aroma of food, and has a sweetening effect on sweets. One part maltitol can be used in place of four parts coumarin. Adding 5-200g maltitol per ton of feed can promote the rapid growth of piglets.

Synthesis of Maltol

1. Preparation of methyl bromide
In a 1 000 L enamel reaction pot, 120 kg of water and 400 kg of 98% concentrated sulfuric acid were first added under stirring (then 270 kg of reused acid from the previous batch and 232 kg of new concentrated sulfuric acid were added in each batch). Then, the jacket steam was used to heat the inner temperature to 90 °C, and a mixture of 64 kg methanol and 344 kg 47% hydrobromic acid was added from the overhead tank at a rate of 65 kg/h under stirring, and the reaction temperature was kept at 90~95 °C. . The gas produced by the reaction passes through the reflux condenser, and the methanol, water and hydrobromic acid contained in the gas flow are taken away by reflux at 10~30 °C. The generated non-condensable methyl bromide gas is dried by the alkali washing tower, concentrated sulfuric acid drying tower, calcium chloride drying tower, and finally condensed into liquid methyl bromide at -5~10 ℃ through the condenser into the steel cylinder. The hydrobromic acid and methanol mixture was added in about 6 h, and the reaction was continued for 1 h after the addition. Each batch can collect 165~175 kg of methyl bromide, the content is more than 98%, and the yield is 85%~90%.

2. Preparation of α-methylfuran methanol
1) Preparation of Grignard reagent – methylmagnesium bromide: In a dried 1 000 L stainless steel autoclave, add a mixture of dried 160 L tetrahydrofuran and 480 L benzene, 32 kg of magnesium chips and The methylmagnesium bromide reaction solution obtained in the second. It was heated to 50 °C under stirring, and methyl bromide was introduced at a rate of 30 kg/h. After 10 min, the reaction started, and the material heated up exothermically. Turn off the vent valve, cool down properly, keep the temperature at 40-50 °C, continue to pass methyl bromide, and pass 155 kg of methyl bromide in about 5 hours. Continue stirring, cool to room temperature, and discharge to the next reaction.

2) Grignard reaction to prepare α-methylfuran methanol: put the previously prepared Grignard reagent in a 1 000 L enamel reaction pot. Cool to 8-10 ℃ under stirring, and slowly add a mixture of 110 kg of furfural and 100 kg of benzene from the high-level tank. The reaction was exothermic, and the reaction temperature was kept at about 10 °C, the addition was completed in about 6 h, and the reaction was continued for 1 h. The reaction solution was put into a 2 000 L enamel reaction pot, and 50 kg of ammonium chloride and 200 L of water were added within 2 h at 10-12 °C for hydrolysis, and the stirring was continued for 1 h after the addition. The material was discharged, and the solid magnesium hydroxide was removed by centrifugal filtration. The filtrate is separated to remove the water layer, the oil layer is distilled to recover the solvent benzene, and the remaining residual liquid of 110-120 kg is released as α-methylfuran methanol, the analysis content is about 95%, and the yield is 85%-90%.

3. Preparation of Maltol
1) Chlorination of α-methylfuran methanol: In a 1 000 L enamel pot, add 380 L of methanol and 224 L of water, and use a jacket to freeze to -20~-30 °C under stirring, while adding 60 kg dropwise The mixed solution of the α-methylfuran methanol prepared in the previous step and 60 L of methanol was fed with chlorine gas to carry out the chlorination reaction. The reaction is exothermic, and the dripping speed and chlorine flow rate are controlled to keep the reaction temperature at -20~-30°C. The dropwise addition was completed in about 4 h, and the chlorine flow was continued for 30 min, and the reaction was terminated when the total chlorine flow reached 75 kg.

2) Hydrolysis of chlorinated products to prepare maltol: The chlorinated liquid is pumped into a 1 000 L distillation pot with a water pump, firstly vacuumed for 1 h to remove residual chlorine, and then methanol is recovered by atmospheric distillation until the internal temperature reaches 100 °C, then changed to reflux for hydrolysis reaction for 3 h, and cooled to room temperature. Put the hydrolyzed solution into a 500 L neutralizing pot, slowly add 20% aqueous sodium hydroxide solution under stirring, neutralize the hydrolyzed solution to pH 2~3, then freeze to -5 °C, and precipitate about 60 kg of crude maltol crystals. After the crude product is subjected to ethanol crystallization, decolorization, water crystallization and other technological processes, the crude maltol is obtained.

Purification of Maltol

A method for decolorization and recrystallization of methyl maltol, comprising the following steps:

(1). First, put 500L of alcohol into the roughing kettle and stir, then put 800kg of the frozen crude product of the chlorinated hydrolysis material into the roughing kettle and heat it to 60℃~70℃ to dissolve it completely.

(2) After the crude product is dissolved, it is pumped into the first decolorization kettle, and 50kg of activated carbon is thrown in. The temperature is controlled at 60°C to 70°C and stirred for 1 hour. The filtered activated carbon is collected and sent to a designated solid waste treatment plant for treatment.

(3). Put 20kg of activated carbon into the second decolorization kettle, and the temperature is controlled at 60℃~70℃ for secondary decolorization (the solution after filtration is colorless and transparent liquid), put it into the filter after half an hour and send it to the freezing kettle for freezing with a circulating pump , the filtered activated carbon is collected and sent to the designated solid waste treatment plant for treatment.

(4). When the temperature of the kettle is frozen below 5°C, put it into a centrifuge and spin to dry to obtain the desired product methyl maltol wet product (white crystal), and then send it to the drying room to dry and package the finished product. The centrifuged liquid is collected and distilled to recover alcohol. The yield is above 95%.

Company Profile and Corporate Culture

Company Profile:

ZhiShang Chemical is owned by ZhiShang Group is a professional new-type chemicals enterprise combined into research and development, production and sales .

The company’s competitive product is pharmaceutical raw materials and intermediates (especially carbohydrate derivatives Series), In recent years, the company has made a major breakthrough in food and feed additives, plant extraction, industrial chemicals industry .

The company insists on the spirit of “sincere management, strict quality control, customer as god” , get consistent high praise from customers at home and abroad.

Corporate Culture:

Help China Chemicals to benefit the happiness of human life
Become the most trusted chemical supplier in the world
Striver – oriented, enrich employees, customer first, deep service, seek development
Be prepared for danger in times of peace, forge ahead actively, unity and cooperation, and be brave to fight

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Additive , Chemical Auxiliary & Catalyst , Organic Chemicals
  • Products/Service: Organic Intermediate,Inorganic Chemistry, APIs, Dyestuffs And Pigments, Fragrance And Spices, Food Additives
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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