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A process for the preparation of a synthetic tanning agent

A technology of tanning agents and polymers, applied in the field of organometallic-polymer preparation, which can solve problems such as toxicity

Inactive Publication Date: 2009-09-02
印度科学工业研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main limiting feature here is that the preparation of the syntan involves the use of chromium for complexation, which raises the toxicity issues associated with chromium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 500 grams of naphthalene and 771 ml of concentrated sulfuric acid were added to a 2L round bottom flask equipped with a stirrer. The contents of the flask were heated at 40°C for 180 minutes with steady stirring. 1 drop of the resulting material was added to a beaker, and 2 ml of water was added to the beaker while shaking. This gave a clear solution free of the odor of free naphthalene. This confirms the completion of the sulfonation reaction. Transfer the sulfonated mass to a reactor equipped with a temperature booster, stirrer and dropping funnel. While maintaining the temperature at 60°C, the mass was stirred continuously for 10 minutes. A mixture of 14 g of sodium citrate, 17 g of phthalic acid and 11 g of sodium formate in 70 ml of water was added to the above sulfonated mass and stirring was continued at 60°C.

[0042] 40 grams of polyacrylic acid was added to the sulfuric acid mixture, and the mixture was heated to 80° C. for 1 hour. A small portion of the ...

Embodiment 2

[0045] 534 grams of anthracene and 326 ml of concentrated sulfuric acid were added to a 2L round bottom flask equipped with a stirrer. With continuous stirring, the contents of the flask were heated to 140°C for 90 minutes, ml of material was added to the beaker, and 3 ml of water was added to the beaker while shaking. The formation of a clear solution without the odor of free naphthalene was observed, confirming the completion of the sulfonation reaction. Transfer the sulfonated mass to a reactor equipped with a temperature booster, stirrer and dropping funnel. While maintaining the temperature at 80°C, the mass was stirred continuously for 10 minutes. A mixture of 5.4 grams of oxalic acid, 4.14 grams of salicylic acid and 10 grams of phthalic acid dissolved in 50 ml of water was added to the above sulfonated substance, and stirring was continued at 80°C.

[0046] 1.5 g of polymethacrylic acid was added to the sulfuric acid mixture, and the mixture was heated to 80° C. for ...

Embodiment 3

[0049] 94 grams of phenol and 54 mL of concentrated sulfuric acid were added to a 250 mL round bottom flask equipped with a stirrer. With continuous stirring, the contents of the flask were heated to 80° C. for 100 minutes, 1 ml of the resulting material was added to the beaker, and 3 ml of water were added. The formation of a clear solution was observed by shaking, which confirmed the completion of the sulfonation reaction. Transfer the sulfonated mass to a reactor equipped with a temperature booster, stirrer and dropping funnel. While maintaining the temperature at 80°C, the mass was stirred continuously for 10 minutes. A mixture of 1.1 g of citric acid, 0.28 g of oxalic acid and 0.56 g of sodium phthalate dissolved in 10 ml of water was added to the above sulfonated substance, and stirring was continued at 70°C.

[0050] 20 grams of polyacrylic acid was added to the sulfuric acid mixture, and the mixture was heated to 70° C. for 1 hour. A small portion of the reaction mi...

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PUM

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Abstract

The present invention discloses a process for the preparation of syntans in which polyfunctional polymers are polymerized with sulfonated aromatic compounds to form a formaldehyde-free organometallic-polymer matrix, wherein the sulfonated aromatic compounds are carried out using organic ligands preprocessing. The application potential of this product in the leather industry, as it ensures an eco-friendly process in chrome tanning by reducing the traditional steeping methods and the problem of total dissolved solids (TDS) associated with effluents, and teaches due to its many The carboxyl group thus contributes to the consumption of chromium. The product can also be used as a retanning agent in the leather industry.

Description

technical field [0001] The present invention relates to the preparation method of synthetic tanning agent. More particularly, the present invention provides a process for the preparation of formaldehyde-free organometallic-polymers for tanning leather. This polymer has great application potential as a pretanning agent as well as retanning agent in the leather processing industry. Background technique [0002] As reported by Sharphouse (Leather Technicians Handbook, Vernon Lock Ltd., London, 1983), syntans are traditionally prepared by concentrating naphthalene / phenolsulfonic acid or formaldehyde-containing urea. [0003] As reported by Stille and Campbell (High Polymer, 27, 14, 1972), the phenol-formaldehyde concentrate product, which is essentially a low molecular weight resinous material, always has the potential to require removal of unreacted phenol or formaldehyde, resulting in Increased risk of toxicity. [0004] Denzinger et al. (U.S. Patent 5,425,784, 1995) have p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/20C14C3/22
CPCC14C3/22C14C3/20
Inventor 莫坎迪·坎西马西帕拉尼萨米·塞尼卡维兰乔纳拉干达·拉奥巴拉钱德雷·尤尼·纳尔西鲁马拉查里·拉马萨米
Owner 印度科学工业研究所
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