CN110642698A - Production method for preparing sorbic acid by acidolysis of sorbic acid polyester - Google Patents
Production method for preparing sorbic acid by acidolysis of sorbic acid polyester Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/09—Preparation of carboxylic acids or their salts, halides or anhydrides from carboxylic acid esters or lactones
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/44—Palladium
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
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Abstract
The invention belongs to the technical field of chemical production, and particularly relates to a production method for preparing sorbic acid by acidolysis of sorbic acid polyester. The method comprises the following steps: (1) putting 150-200 parts of sorbic acid polyester into a reaction kettle, adding deionized water, putting 1-5 parts of modified solid acid catalyst, opening a stirring and steam valve, and heating for acidolysis; (2) filtering while the solution is hot to obtain a sorbic acid aqueous solution; (3) cooling, crystallizing, washing and drying to obtain sorbic acid; the preparation method of the modified solid acid catalyst in the step (1) comprises the following steps: 1) taking polystyrene microspheres or polyacrylic acid microspheres as nanosphere templates, loading a zirconium source solution, drying and roasting to obtain a solid acid catalyst; 2) the solid acid catalyst is used as a carrier, palladium, platinum, zinc, nickel or iron ions are loaded by impregnation, and the loading amount is 0.1-0.5%. The invention can effectively increase the yield of sorbic acid, reduce the byproduct tar amount, has no three wastes and is green and environment-friendly.
Description
Technical Field
The invention belongs to the technical field of chemical production, and particularly relates to a production method for preparing sorbic acid by acidolysis of sorbic acid polyester.
Background
Sorbic acid, formula C6H8O2Also called as cool tea acid, 2, 4-hexadienoic acid and 2-propenyl acrylic acid. Is a food additive, and has inhibitory effect on yeast, mold, etc. It can also be used in animal feed, cosmetics, medicines, packaging materials, rubber adjuvants, etc.
At present, the production process of sorbic acid commonly used in industry is as follows: hydrolyzing the sorbic acid polyester into a crude product of the 2, 4-hexadienoic acid in the presence of concentrated hydrochloric acid or concentrated sulfuric acid, then carrying out alkali dissolution, decoloration, tar filtering, hydrochloric acid neutralization and acidification, filtering, washing and drying to obtain a finished product of the 2, 4-hexadienoic acid. The process has the following disadvantages: the sorbic acid polyester is not depolymerized completely in the presence of concentrated hydrochloric acid or concentrated sulfuric acid, the sorbic acid yield is low, the amount of byproduct tar is large, and the amount of waste water is large. At present, the treatment method of the waste water mainly adopts a biochemical method. The method does not only need to consume a large amount of water for dilution, but also can not recover the sorbic acid with high value contained in the waste water.
Chinese patent CN103570527A discloses a method for preparing potassium sorbate, wherein, 2, 4-hexadienoic acid polyester is depolymerized under the catalysis of a composite solid acid catalyst to obtain a crude product of 2, 4-hexadienoic acid. Although the yield of sorbic acid is improved to a certain extent, the yield is still not very high, and the amount of tar byproduct is still very large.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a production method for preparing sorbic acid by acidolysis of sorbic acid polyester, which adopts a solid acid catalyst modified by an isomerization auxiliary agent, can increase the yield of sorbic acid, reduce the amount of tar byproduct, does not generate three wastes, and is green and environment-friendly.
The production method for preparing sorbic acid by acidolysis of sorbic acid polyester comprises the following steps:
(1) putting 150-200 parts of sorbic acid polyester into a reaction kettle, adding deionized water, putting 1-5 parts of modified solid acid catalyst, starting a stirring and steam valve, heating to the acidolysis temperature of 80-100 ℃, and carrying out acidolysis for 30-120 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain sorbic acid;
the preparation method of the modified solid acid catalyst in the step (1) comprises the following steps:
1) preparation of solid acid catalyst
Taking polystyrene microspheres or polyacrylic acid microspheres as nanosphere templates, loading a zirconium source solution, drying and roasting to obtain a solid acid catalyst;
2) preparation of modified solid acid catalyst
The solid acid catalyst is used as a carrier, palladium, platinum, zinc, nickel or iron ions are loaded by impregnation, and the loading amount is 0.1-0.5%.
Wherein:
the step 1) is as follows:
preparing zirconium oxychloride into a zirconium source solution with the concentration of 20-60%;
soaking the polystyrene microspheres or the polyacrylic acid microspheres into the zirconium source solution for 5-60 min;
filtering, drying, and roasting at 550-650 deg.C for 3-6 h.
The step 2) is as follows:
preparing raw materials containing palladium, platinum, zinc, nickel or iron ions into a solution with the concentration of 0.1-0.5%;
impregnating the solution on a solid acid catalyst;
and (4) carrying out suction filtration, drying and roasting to obtain the modified catalyst.
The drying temperature is 100-150 ℃, and preferably 120 ℃.
The roasting temperature is 600-700 ℃, preferably 650 ℃, and the roasting time is 2-4 hours, preferably 3 hours.
The invention has the following beneficial effects:
1. the method takes polystyrene microspheres or polyacrylic microspheres as nanosphere templates, loads zirconium source solution, and obtains the macroporous zirconia solid acid catalyst (the aperture is more than 430 nm) after sintering, the aperture is far larger than the molecular diameter of sorbic acid polyester, the aperture permeability is more than 95%, and the effective catalytic area is effectively increased. The isomerization auxiliary agent (namely palladium, platinum, zinc, nickel or iron ions) is adopted to modify the catalyst to obtain the cis-trans isomerization catalyst. The sorbic acid polyester can generate a trans-trans structure, a cis-cis structure, a trans-cis structure and a cis-trans structure in the depolymerization process, wherein the trans-trans structure is an active ingredient of sorbic acid, the geometric isomers can be mutually converted by catalytic isomerization, and the cis-cis, trans-cis and cis-trans isomers are converted into trans-trans 2, 4-hexadienoic acid with a relatively stable spatial structure, so that the yield of the active ingredient is further improved, the yield of the sorbic acid can be improved to 94.4 percent to the maximum, and the secondary yield of tar is reduced to 3.2 percent.
2. In the production process, the method has the advantages of no generation of three wastes, environmental protection, capability of recycling the solid acid catalyst for multiple times and strong regeneration capability.
Detailed Description
The present invention is further described below with reference to examples.
The raw materials used in the examples were all commercially available raw materials except for those specifically mentioned.
Example 1
The preparation method of the solid acid catalyst comprises the following steps:
preparing zirconium oxychloride into a zirconium source solution with the concentration of 20% by adopting ethanol, wherein the dosage of the zirconium oxychloride is 20g, and the dosage of the ethanol is 80 g;
soaking 100g of polystyrene microspheres into the zirconium source solution for 60 min;
filtering, drying at 80 ℃, and roasting at 650 ℃ for 3 h.
The internal pore diameter of the prepared solid acid catalyst is 452 nm.
The production method for preparing sorbic acid by acidolysis of the solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 128g of sorbic acid (amount), the yield is 64.0 percent and the purity is 99.2 percent; 50g of tar is produced as a byproduct.
Example 2
The preparation method of the solid acid catalyst comprises the following steps:
preparing zirconium oxychloride into a 40% zirconium source solution by using ethanol, wherein the dosage of the zirconium oxychloride is 40g, and the dosage of the ethanol is 60 g;
soaking 100g of polyacrylic acid microspheres into the zirconium source solution for 30 min;
filtering, drying at 80 ℃, and roasting at 550 ℃ for 6 h.
The internal pore diameter of the prepared solid acid catalyst is 439 nm.
The production method for preparing sorbic acid by acidolysis of the solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 168g of sorbic acid (amount), wherein the yield is 84.0 percent and the purity is 99.1 percent; 26g of tar was produced as a by-product.
Example 3
The preparation method of the solid acid catalyst comprises the following steps:
preparing zirconium oxychloride into a 60% zirconium source solution by using ethanol, wherein the dosage of the zirconium oxychloride is 60g, and the dosage of the ethanol is 40 g;
soaking 100g of polystyrene microspheres into the zirconium source solution for 5 min;
filtering, drying at 80 ℃, and roasting at 600 ℃ for 4 h.
The internal pore diameter of the prepared solid acid catalyst is 430 nm.
The production method for preparing sorbic acid by acidolysis of the solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 178.4g of sorbic acid (amount), the yield is 89.2 percent and the purity is 99.5 percent; 19.4g of tar was produced as a by-product.
Example 4
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing an iron ion solution with the concentration of 0.1%; the solution was immersed on the solid acid catalyst prepared in example 3, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 180.4g of sorbic acid (amount), the yield is 90.2 percent and the purity is 99.3 percent; 17g of tar was produced as a by-product.
Example 5
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing an iron ion solution with the concentration of 0.25%; the solution was immersed in the solid acid catalyst prepared in example 2, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 181.4g of sorbic acid (amount), the yield is 90.7 percent and the purity is 99.2 percent; 8.8g of tar was produced as a by-product.
Example 6
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing an iron ion solution with the concentration of 0.5%; the solution was immersed on the solid acid catalyst prepared in example 3, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 184.2g of sorbic acid (amount), the yield is 92.1 percent and the purity is 99.4 percent; 6.6g of tar was produced as a by-product.
After the modified solid acid catalyst is recycled for 15 times, the yield of sorbic acid prepared by acidolysis is 91.8%, the purity is 99.2%, and the side yield of tar is 4.1% under the same process conditions.
Example 7
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing a nickel ion solution with the concentration of 0.1%; the solution was immersed in the solid acid catalyst prepared in example 2, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 182.2g of sorbic acid (amount), the yield is 91.1 percent and the purity is 99.2 percent; 13.8g of tar was produced as a by-product.
Example 8
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing a nickel ion solution with the concentration of 0.25%; the solution was immersed on the solid acid catalyst prepared in example 3, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 187g of sorbic acid (amount), the yield is 93.5 percent and the purity is 99.4 percent; 8.2g of tar was produced as a by-product.
Example 9
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing a nickel ion solution with the concentration of 0.5 percent; the solution was immersed on the solid acid catalyst prepared in example 3, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 185.4g of sorbic acid (amount), the yield is 92.7 percent and the purity is 99.6 percent; 10g of tar was produced as a by-product.
After the modified solid acid catalyst is recycled for 20 times, the yield of sorbic acid prepared by acidolysis is 92.1%, the purity is 99.5%, and the side yield of tar is 5.2% under the same process conditions.
Example 10
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing a palladium ion solution with the concentration of 0.1 percent; the solution was immersed on the solid acid catalyst prepared in example 3, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 186.4g sorbic acid (in amount), 93.2% yield and 99.5% purity; 9.2g of tar was produced as a by-product.
Example 11
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing a palladium ion solution with the concentration of 0.25%; the solution was immersed in the solid acid catalyst prepared in example 2, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing a nickel ion solution with the concentration of 0.5 percent; the solution was immersed on the solid acid catalyst prepared in example 3, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 188.8g sorbic acid (in the amount of 94.4 wt%) and 99.3% purity; 6.4g of tar was produced as a by-product.
Example 12
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing a palladium ion solution with the concentration of 0.5 percent; the solution was immersed in the solid acid catalyst prepared in example 2, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing a nickel ion solution with the concentration of 0.5 percent; the solution was immersed on the solid acid catalyst prepared in example 3, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 188.4g sorbic acid (in the amount of 94.2%) and 99.4% purity; 10.4g of tar was produced as a by-product.
The modified solid acid catalyst can be recycled for 12 times, and can still meet the requirements of acidolysis for preparing sorbic acid with the yield of 93.6%, the purity of 99.4% and the tar side yield of 5.6% under the same process conditions.
Example 13
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing a platinum ion solution with the concentration of 0.1%; the solution was immersed in the solid acid catalyst prepared in example 2, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 187.6g sorbic acid (amount), 93.8% yield and 99.2% purity; 9.4g of tar was produced as a by-product.
Example 14
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing a platinum ion solution with the concentration of 0.25%; the solution was immersed on the solid acid catalyst prepared in example 3, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 188.2g sorbic acid (in the amount of 94.1 wt%) and 99.4% purity; 7.8g of tar was produced as a by-product.
Example 15
The preparation method of the modified solid acid catalyst comprises the following steps:
preparing a platinum ion solution with the concentration of 0.5%; the solution was immersed on the solid acid catalyst prepared in example 3, filtered, dried at 120 ℃ and calcined at 650 ℃ for 3 h.
The production method for preparing sorbic acid by acidolysis of the modified solid acid catalyst comprises the following steps:
(1) putting 200g of sorbic acid polyester into a reaction kettle, adding 250g of deionized water, putting 5g of modified solid acid catalyst, opening a stirring and steam valve, heating to an acidolysis temperature of 90 ℃, and carrying out acidolysis for 60 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain 188g of sorbic acid (amount), the yield is 94.0 percent and the purity is 99.6 percent; 7.4g of tar was produced as a by-product.
After the modified solid acid catalyst is recycled for 25 times, the yield of sorbic acid prepared by acidolysis is 93.2%, the purity is 99.1%, and the secondary yield of tar is 4.8% under the same process conditions.
Claims (7)
1. A production method for preparing sorbic acid by acidolysis of sorbic acid polyester is characterized by comprising the following steps: the method comprises the following steps:
(1) putting 150-200 parts of sorbic acid polyester into a reaction kettle, adding deionized water, putting 1-5 parts of modified solid acid catalyst, starting a stirring and steam valve, heating to the acidolysis temperature of 80-100 ℃, and carrying out acidolysis for 30-120 min;
(2) filtering while the solution is hot to obtain a sorbic acid aqueous solution;
(3) cooling, crystallizing, washing and drying to obtain sorbic acid;
the preparation method of the modified solid acid catalyst in the step (1) comprises the following steps:
1) preparation of solid acid catalyst
Taking polystyrene microspheres or polyacrylic acid microspheres as nanosphere templates, loading a zirconium source solution, drying and roasting to obtain a solid acid catalyst;
2) preparation of modified solid acid catalyst
The solid acid catalyst is used as a carrier, palladium, platinum, zinc, nickel or iron ions are loaded by impregnation, and the loading amount is 0.1-0.5%.
2. The process for producing sorbic acid by acid hydrolysis of sorbic acid polyester as claimed in claim 1, wherein: the step 1) is as follows:
preparing zirconium oxychloride into a zirconium source solution with the concentration of 20-60%;
soaking the polystyrene microspheres or the polyacrylic acid microspheres into the zirconium source solution for 5-60 min;
filtering, drying, and roasting at 550-650 deg.C for 3-6 h.
3. The process for producing sorbic acid by acid hydrolysis of sorbic acid polyester as claimed in claim 1, wherein: the step 2) is as follows:
preparing raw materials containing palladium, platinum, zinc, nickel or iron ions into a solution with the concentration of 0.1-0.5%;
impregnating the solution on a solid acid catalyst;
and (4) carrying out suction filtration, drying and roasting to obtain the modified catalyst.
4. The process for producing sorbic acid by acid hydrolysis of sorbic acid polyester as claimed in claim 3, wherein: the drying temperature is 100-150 ℃.
5. The process for producing sorbic acid by acid hydrolysis of sorbic acid polyester as claimed in claim 4, wherein: the drying temperature is 120 ℃.
6. The process for producing sorbic acid by acid hydrolysis of sorbic acid polyester as claimed in claim 3, wherein: the roasting temperature is 600-700 ℃, and the roasting time is 2-4 hours.
7. The process for producing sorbic acid by acid hydrolysis of sorbic acid polyester as claimed in claim 6, wherein: the roasting temperature is 650 ℃, and the roasting time is 3 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911052558.3A CN110642698A (en) | 2019-10-31 | 2019-10-31 | Production method for preparing sorbic acid by acidolysis of sorbic acid polyester |
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| CN201911052558.3A CN110642698A (en) | 2019-10-31 | 2019-10-31 | Production method for preparing sorbic acid by acidolysis of sorbic acid polyester |
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| CN111437881A (en) * | 2020-05-06 | 2020-07-24 | 江苏润普食品科技股份有限公司 | Method for preparing sorbic acid by virtue of efficient photocatalytic isomerization |
| CN115784867A (en) * | 2022-12-20 | 2023-03-14 | 江苏润普食品科技股份有限公司 | Method for preparing E-E sorbic acid by depolymerizing sorbic acid polyester under catalysis of solid acid |
| CN115920954A (en) * | 2022-12-20 | 2023-04-07 | 江苏润普食品科技股份有限公司 | Solid base catalyst for catalyzing depolymerization of sorbic acid polyester to prepare sorbic acid and preparation method and application thereof |
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| CN111437881A (en) * | 2020-05-06 | 2020-07-24 | 江苏润普食品科技股份有限公司 | Method for preparing sorbic acid by virtue of efficient photocatalytic isomerization |
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| CN115784867A (en) * | 2022-12-20 | 2023-03-14 | 江苏润普食品科技股份有限公司 | Method for preparing E-E sorbic acid by depolymerizing sorbic acid polyester under catalysis of solid acid |
| CN115920954A (en) * | 2022-12-20 | 2023-04-07 | 江苏润普食品科技股份有限公司 | Solid base catalyst for catalyzing depolymerization of sorbic acid polyester to prepare sorbic acid and preparation method and application thereof |
| CN115920954B (en) * | 2022-12-20 | 2023-10-24 | 江苏润普食品科技股份有限公司 | Solid base catalyst for catalyzing depolymerization of sorbic acid polyester to prepare sorbic acid, preparation method and application thereof |
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