Process for preparing chrome tanning agent

A kind of technology of chrome tanning agent and low-carbon alcohol

Inactive Publication Date: 2003-11-19
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The irregularity of the reduction reaction process makes it difficult to stabilize the quality of the chrome tanning agent, and the color of the wet blue leather tanned with it is quite different, which is not conducive to the subsequent processing of the wet blue leather; in addition, the chrome tanning solution prepared with sugar as the reducing agent High viscosity, making it difficult to dry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Raw materials and ratio:

[0027] Sodium red alum (solid state) 100 parts

[0028] Sulfuric acid (98%) 100 parts

[0029] Butanediol-[1,4] 27 parts

[0030] 181 parts of water

[0031] step:

[0032] 1. Add 100 parts of sodium rubylum to an acid-resistant reaction kettle, and add 100 parts of water to dissolve;

[0033] 2. Slowly add 100 parts of sulfuric acid into the red alum solution;

[0034] 3. Dilute butanediol with 81 parts of water;

[0035] 4. Slowly add diluted butanediol into the reaction kettle, and keep the kettle boiling until the reaction is complete;

[0036] 5. Leave it to mature in the reactor for 24 hours;

[0037] 6. adjust the alkalinity B=33% of chrome liquid with sulfuric acid;

[0038] 7. Spray drying into chrome tanning agent.

[0039] Product performance index of this embodiment: Cr 2 o 3 24%, alkalinity B33%, sodium succinate 5%, all are percentages by weight.

Embodiment 2

[0040] Embodiment 2. As described in embodiment 1, difference is that raw material and proportioning are as follows:

[0041] Sodium red alum (solid state) 100 parts

[0042] Sulfuric acid (98%) 100 parts

[0043] 50 parts of n-propanol

[0044] 200 parts of water

[0045] Product performance index of this embodiment: Cr 2 o 3 24%, alkalinity B33%, sodium propionate 5%, all are percentages by weight.

Embodiment 3

[0046] Embodiment 3. As described in Example 1, the difference is to replace butanediol with methyl alcohol and n-amyl alcohol, and the proportioning is: 20 parts of methyl alcohol, 5 parts of n-amyl alcohol.

[0047] Product performance index: Cr 2 o 3 24%, B3 3%, sodium formate 4%, sodium valerate 1%.

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PUM

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Abstract

A process for preparing chrome tanning agent uses single or mixed low carbon alcohol as reducer, bichromate, sulfuric acid and water and raw material, and includes such steps as dissolving bichromate in water, slowly adding sulfuric acid, dissolving low-carbon alcohol and slowly adding it to a reactor, boiling until reaction is complete, laying aside for aging, regulating pH value and drying to form solid. Its advantages are high stability and high tanning effect.

Description

(1) Technical field [0001] The invention relates to a method for preparing a chrome tanning agent, which belongs to the technical field of leather chemical industry. (2) Background technology [0002] The one-bath chrome tanning method is one of the most important tanning methods at present. The trivalent chromium salt used in this method is generally the chrome tanning liquor prepared by the tannery itself in the early stage, and then the solid chrome tanning agent can be obtained by drying the chrome tanning liquor , it has become the most widely used tanning agent. The traditional method of producing chrome tanning agent is to reduce dichromate to basic trivalent chromium salt with an appropriate reducing agent in an inorganic acid solution, commonly known as chromium salt essence. The most widely used reducing agents in industry are glucose, sucrose, sulfur dioxide and so on. In the production process using sugar as a reducing agent, with the different operating condit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/06
Inventor 程宝箴蒋文强李彦春张铭让
Owner QILU UNIV OF TECH
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