1) Liquid remedy extraction
Removing the crushed initial gum tissue with a liquid option to get a gel cleaning remedy;
2) Sedimentation separation, filtration
The gel washing fluid is subjected to sedimentation and also separation, and after that filteringed system to remove impurities to acquire the gel cleaning fluid filtrate;
3) Readjust the acid worth of the filtrate and also remove impurities by centrifugation
After adjusting the pH worth of the gel laundry filtrate with acid, it is centrifuged to eliminate contaminations by utilizing a centrifuge to get a centrate;
4) Microfiltration to eliminate contaminations
Microfiltration of the centrifugate to acquire a microfiltrate;
5) Ultrafiltration to remove impurities
Ultrafiltration of the microfiltrate to get an ultrafiltration concentrate;
Wherein, also consist of the action of concentrating and also drying the ultrafiltration concentrate, that is, vacuum-concentrate the ultrafiltration concentrate, and then make it dry in a vacuum cleaner state to obtain a lac red pigment solid.
Wherein, in step 1), defined aqueous remedy is industrial tap water, or adopts somewhat alkaline liquid option, where Antacid can be picked sodium carbonate or sodium tetraborate.
Specifically, the pH value of the industrial faucet water is between 7-8; the pH value of the a little alkaline aqueous remedy is between 7-8.
Wherein, in the action 1), the raw gum is first squashed right into fragments as well as contaminations are gotten rid of with a filter, and then the raw rubber bits are liquified in an aqueous service for soaking, and also the weight ratio (glue-liquid proportion) of the raw rubber fragments to the aqueous option is regulated to be 1: 3 ~ 10, preferably 1: 5. Wherein, the pH worth of controlling the washing fluid is between 7 ~ 8; particularly, the bit size of the initial rubber particles is 1-10 millimeters, ideally the fragment dimension of the initial rubber bits is 4-6 millimeters;; The leaching can be duplicated several times, each saturating time is regulated at 0.5-12 hrs, and the soaking time is ideally 4 hrs. Wherein, symphonious 2), clearing up time is managed at 2 ～ 24 hours, is preferably 10 ～ 14 hours; Take on 200 ～ 400 objective stainless-steel displays to filter, can take on 200 orders as well as 400 function stainless steel screens to perform two-stage filtering together.
Wherein, in step 3), the pH worth of the filtrate is adapted to be 3.5 ～ 4, and the acid of the filtrate is adjusted to select several of citric acid, phytic acid, acetic acid, hydrochloric acid.
Wherein, symphonious 4), the membrane layer pore size of the microfiltration membrane embraced is 0.22 ～ 0.80 micron, and the microfiltration membrane layer can choose cellulose ester microfiltration membrane layer; Symphonious 2, the ultrafiltration membrane embraced The molecular weight cut-off is 5000 ～ 30000 daltons, and the ultrafiltration membrane can choose a sort of in polyether sulfone coiled membrane layer, cellulose coiled membrane layer. In particular, the ultrafiltration membrane layer utilized is a polyethersulfone roll membrane.
Wherein, in claimed step 4), when executing microfiltration treatment, the operating pressure difference on both sides of the control microfiltration membrane is 0.05 ~ 0.09 MPa; in step 2, when executing ultrafiltration treatment, control both sides of the ultrafiltration membrane layer 10 ~ 0.40 Mpa 。 The operating stress difference is 0. 10 ~ 0.40 Mpa.
In particular, in the step 4), the microfiltration procedure is an unfavorable stress procedure, as well as the stress on the centrate side of the microfiltration membrane is an atmospheric pressure, as well as the microfiltrate side is unwinded and vacuumed, and also the vacuum cleaner stress is controlled at – 0.05 ～ -0.09 Mpa (being 0 with an air pressure, when regulating the microfiltration procedure, the stress on one side of the microfiltrate is-0.05 ～ -0.09 Mpa about an atmospheric pressure); Be positive stress operation during ultrafiltration process, pick to pressurize on the microfiltrate one side of ultrafiltration membrane layer, control the included pressure to be 0.10 ～ 0.40 Mpa (being 0 with an air pressure, manage the pressure on microfiltrate one side About one atmospheric pressure is 0.10 ～ 0.40 Mpa), as well as the stress on one side of the ultrafiltrate is one air pressure.
Wherein, in step 6), the vacuum cleaner level when controlling the vacuum concentration is-0.06 ～ -0.08 MPa, and also the temperature level is 60 ～ 75 ° C; the temperature throughout the control drying is 75 ～ 100 ° C, and the vacuum degree is-0. 06 ~ -0. 08MPa.
An additional element of today development provides LACCAIC ACID prepared by the above technique.
The LACCAIC ACID improved by the inventive method has the adhering to benefits:
The polished LACCAIC ACID is bright red, as well as the yield of polished lac red pigment is over 0.43% (based upon raw rubber); its signs such as weight reduction on drying out, residue on ignition, heavy metals such as lead as well as arsenic are significantly less than the national requirement, and also lac red The pigment refining effect is noticeable, making sure that the efficiency of lac red pigment fulfills the requirements of the “National Criterion of individuals’s Republic of China-Food Ingredient Lac Red Pigment [GB/ T 4571-1996], as well as the content of heavy metals such as lead as well as arsenic is much lower The material specified in the national basic improves the security of lac red vegan food.
Lac red pigment is refined by membrane layer refining approach, which prevents the addition of a large quantity of acid and antacids, preserves the original chemical framework of lac red pigment, as well as the membrane splitting up innovation is simple, which is a green chemical process and innovation, getting rid of air pollution from the resource.
