阅读说明：本技术 一种用叶酸生产废水制备棉纤维促染剂的方法 (Method for preparing cotton fiber accelerating agent by using folic acid production wastewater ) 是由 尹标林 于 2020-05-13 设计创作，主要内容包括：本发明公开了一种用叶酸生产废水制备棉纤维促染剂的方法,包括以下步骤：1)在叶酸生产废水中通入臭氧调节其化学需氧量,再加入氨水调节其氨氮含量,再调节其pH,得到预处理过的叶酸生产废水；2)将预处理过的叶酸生产废水、聚丙烯酸钠、水解明胶、乳化剂和分散剂混合,得到棉纤维促染剂。本发明对叶酸生产废水进行简单的预处理后,再与聚丙烯酸钠、水解明胶、乳化剂和分散剂混合便可以制备成性能优异的棉纤维促染剂,叶酸生产废水中高浓度的无机盐可以起到促进染料上色的效果,不仅降低了叶酸生产废水的处理成本,而且还实现了叶酸生产废水的资源化循环利用。(The invention discloses a method for preparing a cotton fiber accelerating agent by using folic acid production wastewater, which comprises the following steps: 1) introducing ozone into the folic acid production wastewater to adjust the chemical oxygen demand, adding ammonia water to adjust the ammonia nitrogen content, and adjusting the pH value to obtain pretreated folic acid production wastewater; 2) and mixing the pretreated folic acid production wastewater, sodium polyacrylate, hydrolyzed gelatin, an emulsifier and a dispersant to obtain the cotton fiber accelerating agent. The method can prepare the cotton fiber accelerating agent with excellent performance by simply pretreating the folic acid production wastewater and then mixing the folic acid production wastewater with the sodium polyacrylate, the hydrolyzed gelatin, the emulsifier and the dispersant, and the high-concentration inorganic salt in the folic acid production wastewater can play a role in accelerating dye coloring, so that the treatment cost of the folic acid production wastewater is reduced, and the recycling of the folic acid production wastewater is realized.)

1. A method for preparing a cotton fiber accelerating agent by using folic acid production wastewater is characterized by comprising the following steps: the method comprises the following steps:

1) introducing ozone into the folic acid production wastewater until the chemical oxygen demand of the folic acid production wastewater is reduced to below 10mg/L, adding ammonia water until the ammonia nitrogen content of the folic acid production wastewater is reduced to below 5mg/L, and adjusting the pH of the folic acid production wastewater to 5-7 to obtain pretreated folic acid production wastewater;

2) and mixing the pretreated folic acid production wastewater, sodium polyacrylate, hydrolyzed gelatin, an emulsifier and a dispersant to obtain the cotton fiber accelerating agent.

2. The method for preparing cotton fiber accelerating agent by using folic acid production wastewater according to claim 1, characterized in that: the folic acid production wastewater in the step 1) is wastewater generated in the process of preparing folic acid by a one-pot method of 2,4, 5-triamino-6-hydroxypyrimidine sulfate, trichloroacetone and N- (4-aminobenzoyl) -L-glutamic acid.

3. The method for preparing cotton fiber accelerating agent by using folic acid production wastewater according to claim 1 or 2, characterized in that: in the step 1), the pH value of the folic acid production wastewater is adjusted by adopting a sodium hydroxide solution.

4. The method for preparing cotton fiber accelerating agent by using folic acid production wastewater according to claim 1 or 2, characterized in that: the mass ratio of the pretreated folic acid production wastewater, sodium polyacrylate, hydrolyzed gelatin, emulsifier and dispersant in the step 2) is (90-95): (1-2): (1-3): (2-3): (1-2).

5. The method for preparing cotton fiber accelerating agent by using folic acid production wastewater according to claim 4, characterized in that: the number average molecular weight of the sodium polyacrylate in the step 2) is 3000-8000 g/mol.

6. The method for preparing cotton fiber accelerating agent by using folic acid production wastewater according to claim 4, characterized in that: and 2) the emulsifier is at least one of fatty acid soap, alkyl sulfate, alkylbenzene sulfonate, polyoxyethylene ether and polyoxypropylene ether.

7. The method for preparing cotton fiber accelerating agent by using folic acid production wastewater according to claim 6, characterized in that: the number average molecular weight of the polyoxyethylene ether is 800-20000 g/mol.

8. The method for preparing cotton fiber accelerating agent by using folic acid production wastewater according to claim 6, characterized in that: the number average molecular weight of the polyoxypropylene ether is 800-20000 g/mol.

9. The method for preparing cotton fiber accelerating agent by using folic acid production wastewater according to claim 4, characterized in that: the dispersant in the step 2) is at least one of polyethylene glycol and hexamethylphosphoric triamide.

10. The method for preparing cotton fiber accelerating agent by using folic acid production wastewater according to claim 9, characterized in that: the number average molecular weight of the polyethylene glycol is 150-550 g/mol.

Technical Field

The invention relates to a method for preparing a cotton fiber accelerating agent by using folic acid production wastewater.

Background

Folic acid (also known as vitamin B9) is a pteroic acid monoglutamic acid, is one of vitamin B complexes, can be used for treating diseases such as neural tube malformation and infantile megaloblastic anemia, and can also be used as food additive and livestock feed. The domestic demand of folic acid is continuously increased, so that the realization of the industrial production of folic acid is of great significance. At present, the annual production total amount of folic acid in the global range is about 2000 tons, wherein 10 percent of folic acid is medicinal folic acid, and 90 percent of folic acid is used for food additives, livestock feeds and the like. According to the analysis of experts in the industry, the annual demand growth rate of folic acid in the future is 5% -8%, and the market demand is huge.

The traditional synthesis method of folic acid comprises the following steps:

1) dispersing 2,4, 5-triamino-6-hydroxypyrimidine sulfate, trichloroacetone and N- (4-aminobenzoyl) -L-glutamic acid in water by a one-pot method to prepare a folic acid crude product, and refining to obtain a pure folic acid product (for example: CN 101182323A; CN 102558180A; synthesis of folic acid, journal of chinese medical industry, 2014,45 (6): 511-512; a novel process for producing feed additive folic acid, Hebei industrial science and technology, 2010,27(5),309-310 and 350), the method has the disadvantages that the solubility of 2,4, 5-triamino-6-hydroxypyrimidine sulfate in water is very small, only a small part of the 2,4, 5-triamino-6-hydroxypyrimidine sulfate is dissolved in water, most of the folic acid exists in a solid form, the generated folic acid is also difficult to dissolve in water and can be separated out in a solid form, the generated folic acid solid particles can wrap unreacted 2,4, 5-triamino-6-hydroxypyrimidine sulfate, and the wrapped 2,4, 5-triamino-6-hydroxypyrimidine sulfate cannot be continuously reacted, so that the reaction is incomplete, and the yield of folic acid is low. In addition, the amount of sewage produced by the method is large, and about 200 tons of wastewater is produced for every 1 ton of folic acid produced by the industry. Aiming at the problem of large amount of wastewater, the purpose of recycling water is achieved by adsorbing and decoloring the wastewater by using resin, but the consumption of the resin is large, the treatment cost is high, and the salt content of the water is increased continuously in the recycling process (CN 101323614A);

2) dispersing 2,4, 5-triamino-6-hydroxypyrimidine sulfate, N- (4-aminobenzoyl) -L-glutamic acid and alpha, beta-dibromopropionaldehyde in acetic acid-sodium acetate buffer solution to react to obtain a folic acid crude product, and then refining to obtain folic acid containing two molecular crystal water, wherein the total yield of the method is only 26.9%, and the alpha, beta-dibromopropionaldehyde is unstable, high in price and easy to decompose in a reaction system;

3) the method is characterized in that 1,1,3, 3-tetramethoxy-2-propanol or 2-hydroxypropanedialdehyde and N- (4-aminobenzoyl) -L-glutamic acid are mixed and reacted to obtain corresponding diimine, and the diimine is reacted with 2,4, 5-triamino-6-hydroxypyrimidine sulfate in the presence of sulfite to obtain folic acid.

At present, the folic acid is prepared by a one-pot method mainly in industry, the waste water is large in amount, the waste water contains high-concentration inorganic salts such as sodium sulfate and sodium chloride, the high-salt waste water cannot be directly discharged, the inorganic salts are converted into solid waste through multi-effect evaporation and then treated, the treatment cost is too high, and thus, a plurality of folic acid production enterprises face the situation of shut-down. Therefore, how to treat the folic acid production wastewater as resources is a technical problem which needs to be solved urgently.

Disclosure of Invention

The invention aims to provide a method for preparing a cotton fiber accelerating agent by using folic acid production wastewater.

The technical scheme adopted by the invention is as follows:

a method for preparing a cotton fiber dyeing accelerant by using folic acid production wastewater comprises the following steps:

1) introducing ozone into the folic acid production wastewater until the chemical oxygen demand of the folic acid production wastewater is reduced to below 10mg/L, adding ammonia water until the ammonia nitrogen content of the folic acid production wastewater is reduced to below 5mg/L, and adjusting the pH of the folic acid production wastewater to 5-7 to obtain pretreated folic acid production wastewater;

2) and mixing the pretreated folic acid production wastewater, sodium polyacrylate, hydrolyzed gelatin, an emulsifier and a dispersant to obtain the cotton fiber accelerating agent.

Preferably, the folic acid production wastewater in the step 1) is wastewater generated in the process of preparing folic acid by using 2,4, 5-triamino-6-hydroxypyrimidine sulfate, trichloroacetone and N- (4-aminobenzoyl) -L-glutamic acid through a one-pot method.

Preferably, the pH of the folic acid production wastewater is adjusted by using a sodium hydroxide solution in the step 1).

Preferably, the mass ratio of the pretreated folic acid production wastewater in the step 2) to the sodium polyacrylate, the hydrolyzed gelatin, the emulsifier and the dispersant is (90-95): (1-2): (1-3): (2-3): (1-2).

Preferably, the number average molecular weight of the sodium polyacrylate obtained in the step 2) is 3000-8000 g/mol.

Preferably, the emulsifier in step 2) is at least one of fatty acid soap, alkyl sulfate, alkylbenzene sulfonate, polyoxyethylene ether and polyoxypropylene ether.

Preferably, the number average molecular weight of the polyoxyethylene ether is 800-20000 g/mol.

More preferably, the number average molecular weight of the polyoxyethylene ether is 2000-8000 g/mol.

Preferably, the number average molecular weight of the polyoxypropylene ether is 800-20000 g/mol.

More preferably, the number average molecular weight of the polyoxypropylene ether is 2000-8000 g/mol.

Preferably, the dispersant in step 2) is at least one of polyethylene glycol and hexamethylphosphoric triamide.

Preferably, the number average molecular weight of the polyethylene glycol is 150-550 g/mol.

Further preferably, the polyethylene glycol is at least one of polyethylene glycol 200(PEG-200) and polyethylene glycol 400 (PEG-400).

The invention has the beneficial effects that: the method can prepare the cotton fiber accelerating agent with excellent performance by simply pretreating the folic acid production wastewater and then mixing the folic acid production wastewater with the sodium polyacrylate, the hydrolyzed gelatin, the emulsifier and the dispersant, and the high-concentration inorganic salt in the folic acid production wastewater can play a role in accelerating dye coloring, so that the treatment cost of the folic acid production wastewater is reduced, and the recycling of the folic acid production wastewater is realized.

Detailed Description

The invention will be further explained and illustrated with reference to specific examples.