Method for preparing industrial-grade collagen and chromium tannin retanning agent from chromium-containing leather crushed materials and application

A technology for chromium tannin retanning agent and raw protein, which is applied in the field of chemical and chemical industry, can solve the problem of failing to effectively prepare high-quality collagen and chromium tannin retanning agent, and failing to realize the recycling of chromium-containing leather scraps. Chromium-containing sludge cannot be fully digested, etc., to achieve the effect of low treatment cost, realization of resource recycling, and reduction of the pressure of treatment cost

Active Publication Date: 2020-03-24
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the chromium-containing scraps are hydrolyzed by lime to recover collagen, a large amount of chrome sludge is produced. At present, there is no mature engineering technology in China for the full resource disposal and utilization of such chromium sludge. , can only be transferred to a qualified environmental protection company for treatment at a high price, so that the chromium-containing sludge cannot be fully digested
From this point of view, the recycling of resources in the true sense of chromium-containing scraps has not been realized, but the transfer of hazardous waste
At the same time, since the dry basis of chrome ash sludge contains about 14% Cr(Ⅲ) and about 20%-30% collagen, this also causes a great waste of resources
[0004] The processing technology of chromium-containing leather scraps in the prior art has not been able to effectively prepare high-quality collagen and chrome tannin retanning agent, and an effective method for reusing the product in leather preparation

Method used

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  • Method for preparing industrial-grade collagen and chromium tannin retanning agent from chromium-containing leather crushed materials and application
  • Method for preparing industrial-grade collagen and chromium tannin retanning agent from chromium-containing leather crushed materials and application
  • Method for preparing industrial-grade collagen and chromium tannin retanning agent from chromium-containing leather crushed materials and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 A method of preparing industrial-grade collagen and chrome tannin retanning agent with chrome-containing leather scraps

[0024] (1) Washing and desalting with water

[0025] Add 1.5 t of chrome-containing dander and 3.0 t of water to a wooden drum with a diameter of 3.5 m, rotate at a speed of 30 r / min, adjust the temperature to 45°C, rotate and wash for 60 min, squeeze water, and control drying to obtain the moisture content of dander If it is above 60%, reserve;

[0026] (2) Alkali expansion

[0027] Add the skin flakes after washing and desalting with water in step (1) into an 8 t stainless steel reactor, add 3.0 t of water, stir and disperse, add about 150 kg of sodium hydroxide solution, and adjust the pH to 8.5~9.5. Set the reaction kettle: the temperature is 55°C, keep warm for 10 h, the stirring speed is 40 r / min, stop stirring after stirring for 5 minutes, and continue stirring after stopping for 55 minutes; the sodium hydroxide solution: the mass ...

Embodiment 2

[0040] Embodiment 2 A method for preparing technical grade collagen and chrome tannin retanning agent with chrome-containing leather scraps

[0041] (1) Washing and desalting with water

[0042] Add 1.5 t of chrome-containing dander and 3.0 t of water into a wooden drum with a diameter of 3.5 m, rotate at a speed of 20 r / min, adjust the temperature to 50°C, rotate and wash for 90 min, squeeze the water, and control the drying to obtain the moisture content of the dander at More than 60%, reserve;

[0043] (2) Alkali expansion

[0044] Add the skin flakes after washing and desalting with water in step (1) into an 8 t stainless steel reactor, add 3.0 t of water, stir and disperse, add about 150 kg of sodium hydroxide solution, and adjust the pH to 8.5~9.5. Set the reaction kettle: the temperature is 45°C, keep warm for 12 h, stir at a speed of 50 r / min, stop stirring after stirring for 10 min, and continue stirring after stopping for 50 min; the sodium hydroxide solution: the ...

Embodiment 3

[0057] Embodiment 3 A kind of method that prepares technical grade collagen and chrome tannin retanning agent with chrome skin scrap

[0058] (1) Washing and desalting with water

[0059] Add 1.5 t of chrome-containing dander and 3.0 t of water to a wooden drum with a diameter of 3.5 m, rotate at a speed of 40 r / min, adjust the temperature to 40°C, rotate and wash for 80 min, squeeze the water, and control the drying to obtain dander with a moisture content of More than 60%, reserve;

[0060] (2) Alkali expansion

[0061] Add the skin flakes after washing and desalting with water in step (1) into an 8 t stainless steel reactor, add 3.0 t of water, stir and disperse, add about 150 kg of sodium hydroxide solution, and adjust the pH to 8.5~9.5. Set the reaction kettle: the temperature is 50°C, keep warm for 10 h, stir at a speed of 40 r / min, stop stirring after stirring for 5 min, and continue stirring after stopping for 55 min; the sodium hydroxide solution: the mass percentag...

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Abstract

The invention provides a method for preparing an industrial-grade collagen and chromium tannin retanning agent by using chromium-containing leather crushed materials and application of the industrial-grade collagen and chromium tannin retanning agent. The method comprises the following steps: water washing desalination, alkali expansion and enzyme hydrolysis reaction to prepare the industrial-grade collagen and chromium tannin retanning agent, wherein the mass ratio of the chromium-containing leather crushed materials to water is 1: 2, and the moisture content of the obtained leather scraps is60% or above. And in the alkali expansion step, water and the chromium-containing leather crushed materials subjected to water washing and desalination are added into a reaction kettle, and a sodiumhydroxide solution is added for alkali expansion, wherein the enzyme hydrolysis reaction comprises the following steps: reducing the temperature of a reaction system to 40-50 DEG C, and adding compound alkaline protease, lipase and alpha-amylase to carry out the enzyme hydrolysis reaction under the condition of medium-speed stirring. Zero-emission and full-resource utilization of the chromium-containing leather crushed materials are achieved, and the method has important social, economic and environment-friendly significance.

Description

technical field [0001] The invention relates to a method and application for preparing industrial-grade collagen and chrome tannin retanning agent from chrome-containing skin scraps, belonging to the field of chemical engineering, and as a technical method for high-value utilization of hazardous solid waste resources. Background technique [0002] Chromium-containing leather scraps are chromium-containing solid wastes such as leather slag, leather powder, and leather shavings produced during the production process of tanning leather with chrome tanning agents. Since the promulgation and implementation of the "National Hazardous Waste List" in 2008, "chrome-containing leather scraps produced by the leather cutting process" have been included. The problem of chromium-containing leather scraps is further expanded, and a large amount of chromium-containing leather scraps are backlogged in tanneries for a while, which has become the focus of today's restricted leather industry. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/32C14C3/06C14C3/22
CPCC14C3/06C14C3/22C14C3/32Y02W30/50
Inventor 杨茂李彦春芮浪祝德义
Owner QILU UNIV OF TECH
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