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Chromium-containing waste leather scrap treatment method

A treatment method and dander technology, which is applied in the field of chromium-containing waste dander treatment, can solve problems such as waste of resources and environmental hazards, achieve mild hydrolysis, ensure stability, and ensure the effect of hydrolysis quality

Active Publication Date: 2020-05-12
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early days, chromium-containing waste dander mainly used traditional waste disposal methods: landfill or incineration; although chromium-containing waste dander can be effectively disposed of, it will bring great harm to the environment and at the same time caused a great waste of resources

Method used

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  • Chromium-containing waste leather scrap treatment method
  • Chromium-containing waste leather scrap treatment method
  • Chromium-containing waste leather scrap treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of 7-chloro-2H-benzo[e][1,2,3,4]thitriazine 1,1-dioxide is:

[0027] 2mmol 2-amino-5-chlorobenzenesulfonamide, 3mmol tert-butyl nitrite and 20ml solvent acetonitrile were added to the reaction vessel, stirred and mixed, and the reaction was carried out at a temperature of 25°C after mixing evenly, and the reaction time was 2h; After completion, filter and purify to obtain 7-chloro-2H-benzo[e][1,2,3,4]thitriazine 1,1-dioxide; the product yield is 90%.

[0028] Its reaction formula is

[0029]

[0030] Characterization data

[0031] 1 H NMR (400MHz, CDCl 3 )δ8.11(s,1H),7.64-7.61(m,1H),7.37-7.34(m,1H),7.18(s,1H); 13 C NMR (100MHz, CDCl 3 )δ145.2,132.2,131.8,130.9,126.3,121.7.

Embodiment 2

[0033] A method for treating chrome-containing waste dander, comprising the following steps: the addition of additives in each operation is based on the quality of chrome-containing waste dander:

[0034] Step 1: Add chrome-containing waste dander and 150% deionized water into the reaction vessel, stir and mix, after mixing evenly, add 5% protease into the reaction vessel for the first hydrolysis at a temperature of 37°C processing, the processing time is 4h;

[0035] Step 2: add 20% acid solution into the reaction vessel for stirring and mixing, and form a mixed solution after mixing evenly; under the condition of a temperature of 45°C, carry out the second hydrolysis treatment, and the treatment time is 5h;

[0036] Step 3: Adjust the pH of the mixture to 5.0-6.0 with an aqueous sodium carbonate solution with a mass concentration of 15%; then add 3% modifier, 1% accelerator, 2% dispersant and 0.5% catalyst to the mixture and stir After mixing, the retanning filler was prepa...

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Abstract

The invention discloses a chromium-containing waste leather scrap treatment method. The method comprises the following steps: carrying out hydrolysis treatment on chromium-containing waste leather scraps serving as a raw material, and carrying out enzyme hydrolysis on the chromium-containing waste leather scraps by using protease; carrying out further hydrolysis on the chromium-containing waste leather scraps by using an acid solution to hydrolyze the chromium-containing waste scraps into collagen polypeptide molecules, wherein the acid solution is a mixture of an aqueous sulfuric acid solution and an aqueous lactic acid solution; then modifying the collagen polypeptide molecules with a modifier, wherein the modifier is consisting mixture of of 2,3-pyridinedioic anhydride, 7-chloro-2H-benzo[e][1,2,3,4]thiatriazine-1,1-dioxide and 4,4'-diamino-3,3'-biphenyl disulfonic acid, wherein the 7-chloro-2H-benzo[e][1,2,3,4]thiatriazine-1,1-dioxide is obtained by reacting 2-amino-5-chlorobenzenesulfonamide with tert-butyl nitrite; and performing treatment to process the chromium-containing waste leather scraps into a retanning filler. The retanning filler has a good tanning and retanning filling effect, and tanned leather is full, soft, good in elasticity and clear and fine in grain.

Description

technical field [0001] The invention relates to the technical field of leather chemical industry, in particular to a method for processing chromium-containing waste dander. Background technique [0002] my country is a big country of tanning, which produces millions of tons of leather waste every year, about half of which are chrome-containing waste dander. These solid wastes are one of the important factors that cause serious pollution in the leather industry. In the early days, the chrome-containing waste shavings were mainly treated by traditional waste disposal methods: landfill or incineration; although the chrome-containing waste shavings could be effectively treated, it would bring great harm to the environment, and also Caused a great waste of resources. With the increasingly severe global ecological problems such as resources and the environment, the development of the leather industry is faced with the challenge of the "sustainable development" strategy; people ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/18
CPCC14C3/18
Inventor 柴玉叶许晓红柴玉枝邹祥龙
Owner WENZHOU UNIVERSITY
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