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Method for treating leather by using tannery wastewater and method for producing leather

A technology for tanning wastewater and leather, which is applied in animal processing wastewater treatment, small hide/big hide/leather/fur treatment, tanning treatment, etc. issues such as recycling

Active Publication Date: 2014-02-26
德瑞(常州)特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (2) It is difficult to determine the components in wastewater
But as far as the inventors know, before the present invention, such a simple and effective method has not been found yet, and the complete recycling of tannery wastewater has not been realized

Method used

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  • Method for treating leather by using tannery wastewater and method for producing leather
  • Method for treating leather by using tannery wastewater and method for producing leather
  • Method for treating leather by using tannery wastewater and method for producing leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0140] Embodiment 1: wet blue leather (cowhide upper leather) neutralization process

[0141] (I) Main chemical materials:

[0142] TANIGAN PAK-N-C (phenols), product of LAXESS.

[0143] Wet blue leather (cowhide upper leather);

[0144] (II) Process (the amount added here is for the weight of the processed hide, based on 100 parts of the tare weight)

[0145] Process: (blue leather) peeling → weighing → washing → neutralization (to pH5.0) → retanning → washing → fatliquoring → adjusting pH → washing → drumming.

[0146] After the blue skin is evenly peeled, weighed, and washed with water, it begins to be neutralized and divided into four groups: A, B, C, and D. The details are as follows:

[0147] A. It is a blank sample without adding TANIGAN PAK-N-C,

[0148] 150 parts of water (40°C) and 1.5 parts of sodium formate and 0.5 parts of baking soda were treated at about 40°C for 60 minutes.

[0149] B. With fresh water, the amount of material TANIGAN PAK-N-C added is 4% of...

Embodiment 2

[0174] Embodiment 2: simple retanning process of wet blue leather:

[0175] (I) Main material

[0176] TANIGANLT-C, product of LANXESS.

[0177] Leather to be treated: Neutralized wetblue (cowhide upper leather).

[0178] (II) Process

[0179] Technological process (the amount added here is for the weight of the processed hide, based on 100 parts of the tare weight)

[0180] Process: (blue leather) peeling → weighing → washing → neutralization (to pH5.0) → retanning → washing → fatliquoring → adjusting pH → washing → drumming.

[0181] After the blue skins are evenly shaved, weighed, washed, and neutralized, retanning begins, and they are divided into four groups: A, B, C, and D, as follows:

[0182] A. It is a blank sample without adding TANIGAN LT-C,

[0183] Add 100 parts of water, treat at 40°C for 60 minutes, and then add 0.5 parts of 85% formic acid for 20 minutes.

[0184] B. With fresh water, the amount of material TANIGAN LT-C added is 6% of the tare weight,

...

Embodiment 3

[0208] Embodiment 3: standard retanning process

[0209] (I) Main material

[0210] TANIGAN LT-C (phenols), product of LANXESS.

[0211] LEVOTAN 1084 (acrylic), product of LANXESS.

[0212] RATINGAN R7 (dicyandiamides), product of Lanxess.

[0213] Leather to be treated: wet blue (cowhide upper leather).

[0214] (II) Process

[0215] Technological process (the amount added here is for the weight of the processed hide, based on 100 parts of the tare weight)

[0216] Process: (blue leather) peeling → weighing → washing → neutralization (to pH5.0) → retanning → washing → fatliquoring → adjusting pH → washing → drumming.

[0217] After the blue leather is shaved, weighed, washed, and neutralized, retanning begins, and it is divided into two groups, A and B, as follows:

[0218] A. For fresh water plus tanning material treatment,

[0219] First add 100 parts of water, then add 6 parts of TANIGAN LT-C, 4 parts of LEVOTAN 1084, 6 parts of RETINGAN R7 and treat at 40°C for 60 ...

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PUM

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Abstract

A method for treating leather by using leather production wastewater and a method for producing leather. The method for treating leather by using leather production wastewater comprises: (a) obtaining the near infrared spectrum of leather production wastewater generated from leather production processes with a near infrared spectrum sensing probe; (b) determining or reading the concentration of components in the leather production wastewater through the obtained near infrared spectrum by means of a pre-established near infrared spectrum data model; (c) adding, according to the concentration of components in the leather production wastewater, raw materials into the leather production wastewater until being up to the concentration required for the leather production processes to obtain prepared leather production wastewater; (d) treating leather by using the prepared leather production wastewater to perform the leather production processes, the near infrared spectrum data model comprising the mapping between the near infrared spectrum and the concentration of components. The method for treating leather by using leather production wastewater implements the cyclic use of leather production wastewater and is environmentally friendly.

Description

technical field [0001] The invention relates to a method for treating leather with tannery wastewater and a method for producing leather. Background technique [0002] With the rapid development of the economy, people's understanding of health and environmental protection is getting deeper and deeper. At present, the wastewater produced in the tanning process contains a large amount of organic substances. If it is directly discharged into the river, it will cause irreversible damage to the water environment. Therefore, the treatment and discharge of wastewater has become an increasingly stringent curse in the tanning industry. How to treat wastewater, reduce wastewater, and reduce emissions is a topic that research institutions and tanneries are currently exploring. [0003] Generally, the reduction of wastewater discharge can be considered from three aspects: [0004] The first way of thinking is to control from the source. To avoid the use of toxic and harmful substance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C1/00C14C3/02C14C9/02G01N21/359
CPCG01N21/3577C14C3/32G01N21/359C02F2103/24Y02W30/50
Inventor 李靖赵婧
Owner 德瑞(常州)特种材料有限公司
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