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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: 2006-09-27
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 for 180 minutes at 40°C with steady stirring. One drop of the obtained material was added to the beaker, and 2 ml of water was added to the beaker while shaking. This gave a clear solution with no free naphthalene odor. This confirms the completion of the sulfonation reaction. The sulfonated material was transferred to a reactor equipped with a temperature agent, agitator and dropping funnel. The mass was continuously stirred for 10 minutes while maintaining the temperature at 60°C. To the above sulfonated material was added a mixture of 14 grams of sodium citrate, 17 grams of phthalic acid and 11 grams of sodium formate in 70 ml of water 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 sm...

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 substance was added to the beaker, and 3 ml of water was added to the beaker while shaking. The formation of a clear solution with no free naphthalene odor was observed, confirming the completion of the sulfonation reaction. The sulfonated material was transferred to a reactor equipped with a temperature agent, agitator and dropping funnel. The mass was continuously stirred for 10 minutes while maintaining the temperature at 80°C. To the above sulfonated material was added a mixture of 5.4 g of oxalic acid, 4.14 g of salicylic acid and 10 g of phthalic acid dissolved in 50 ml of water, and stirring was continued at 80°C.

[0046] 1.5 grams of polymethacrylic acid was added to the sulfuric acid mixture, and the mixture was heated to 80°C for 1 hour. ...

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, confirming the completion of the sulfonation reaction. The sulfonated material was transferred to a reactor equipped with a temperature agent, agitator and dropping funnel. The mass was continuously stirred for 10 minutes while maintaining the temperature at 80°C. To the above sulfonated material was added 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, 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 mixt...

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PUM

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Abstract

A process for the p reparation of a synthetic tanning a gent is disclosed whereby multi functional polymer is polymerized with sulfonated aromatic compound, pretreated with organic ligand to form an organo-polymeric matrix, free from formaldehyde. The product has potential application in leather industry for not only ensuring an eco-friendly approach in chrome tanning by way of eliminating the conventional pickling process and the resulting problem of total dissolved solids (TDS) associated with the effluent, but also suggesting an exhaust aid for chrome because of its multiple carboxyl groups. The product can also be used as a retanning agent in leather processing.

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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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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