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Leather manufacturing process by pickling and tanning salt-free and chrome-free recycled waste liquid

A chrome-free tanning and waste liquor technology, applied in application, chemical treatment before tanning, small raw hide/large hide/leather/fur treatment, etc., can solve the problem of chrome pollution, tanning wastewater pollution and discharge problems, etc question

Active Publication Date: 2014-05-28
宝斯卡(商丘)化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can significantly reduce the amount of chromium, but they have not completely solved the chromium pollution, nor have they solved the pollution and discharge problems of tanning wastewater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Use sulfuric acid to adjust the pH value of the waste liquid to 0.9, then carry out pickling and tanning. Turn for 20 minutes; 0.5% sulfuric acid, add in three equal parts, each interval is 10 minutes, turn for 90 minutes; 0.2% fatliquor, turn for 30 minutes, stop for 2 hours; Aldehyde, 5.0% white tannin, turn for 3 hours, stop drum overnight.

Embodiment 2

[0013] Use sulfuric acid to adjust the pH value of the waste liquid to 1.2, and then carry out pickling tanning. The process is: 4% salt, 0.15% antifungal agent, turn for 10 minutes; 0.3% sulfuric acid, turn for 10 minutes; 70% waste liquid, turn for 10 minutes Minutes; 0.5% formic acid, turn for 20 minutes; 0.3% sulfuric acid, add three times in equal intervals, each interval of 10 minutes, turn for 90 minutes; stop for 2 hours; 60% waste liquid, warm up to 30 ° C, 1.0% glutaraldehyde, 5.0% White tannin, turn for 3 hours, stop drum overnight.

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PUM

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Abstract

The invention provides a leather manufacturing process by pickling and tanning a salt-free and chrome-free recycled waste liquid. The process is characterized in that no chrome is used in the tanning process, thus the problem of chrome pollution is solved thoroughly; all the chrome tanning-free waste liquid is recycled, thus zero discharge of chrome tanning-free waste liquid is realized; and the process is suitable for the existing large production process of leather factories. In addition, no salt is added in the pickling process, a large amount of salt and other related chemical materials can be saved, wherein the salt can be saved by 100%, and the other related chemical materials can be saved by 40%-60%, and the energy can be saved by 25% approximately. Each performance index of the finished leather manufactured by the process meets the requirements, the rate of loose surface of the finished leather is decreased effectively, and the compactness of the finished leather is improved.

Description

technical field [0001] The invention belongs to the green recycling process of making full use of raw materials to reduce pollution discharge in the technical field of leather production. A salt-free and chromium-free leather-making process is introduced in which waste liquid is recycled indefinitely for pickling and tanning. Background technique [0002] Chrome tanning has always been dominant in the leather tanning process because of its excellent performance, and chrome salt has been used as a tanning agent in leather production for more than 100 years. Because its tanned leather has many advantages, such as high shrinkage temperature of finished leather, storage resistance, good chemical stability, softness and extensibility, chromium salt is the best material for making light leather, and is widely used in the leather industry. Widely used, currently more than 400,000 tons of chrome tanning agents are used for tanning every year. But Cr 6+ is a strong carcinogen, Cr ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C1/08C14C3/08C02F9/04
Inventor 张壮斗
Owner 宝斯卡(商丘)化工有限公司
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