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Method and device for producing chromium tanning agent by using oxidized waste liquid obtained from S wax production

A chrome tanning agent and waste liquor technology, which is applied in the fields of montan wax deep processing, coal chemical industry and leather chemical industry, can solve the problems of high recovery cost and waste of oxidation waste liquor, and achieve sustainable development, low consumption and simple process. Effect

Active Publication Date: 2014-03-19
QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chromium preparations are often used for oxidation in the production of S wax, and the resulting oxidation waste liquid is often wasted due to the high recovery cost.

Method used

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  • Method and device for producing chromium tanning agent by using oxidized waste liquid obtained from S wax production

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0029] The mass percent of chromic anhydride solution, sodium dichromate solution, oxidizing acid solution, and glucose solution described in step A is 50%; add montan wax by 30% of oxidizing acid solution weight in B step, be heated to 90 ℃, with 60 ~ 100r / min was continuously stirred for 60min; the amount of sodium dichromate solution added in step C was 2 times of the weight of montan wax, and left to settle for 60min after stopping the reaction; step D was continuously stirred at 60~100r / min for 90min, Stand in the middle tank 4 for 390min.

[0030] The tail gas produced by the redox kettle 20, the modulation reaction kettle 3, the drying tower 6, and the separator 7 enters the tail gas absorption tower 10, and the water sent into the tail gas by the circulating water storage tank 11 absorbs the oxidized waste liquid therein. The residual gas is discharged, and the residual liquid rich in oxidized waste liquid is introduced into the oxidized waste liquid storage tank 1 . ...

Embodiment 1

[0050] Select the montan wax of resin content2 Cr 2 o 7 +4H 2 SO 4 → Na 2 SO 4 + Cr 2 (SO 4 ) 3 +4H 2 O+3{O} Calculate the theoretical addition of sodium dichromate solution, according to the reaction formula 4Na 2 Cr 2 o 7 +12H 2 SO 4 +C 6 h 12 o 6 →8Cr(OH)SO 4 +4Na 2 SO 4 +6CO 2 ↑+14H 2 O Calculate the theoretical addition amount of glucose solution; take sodium dichromate solution according to the theoretical addition amount, get glucose solution according to 110% of the theoretical addition amount, and then slowly add in the modulation reaction kettle 3; start stirring, at 105 ~ 110 ° C, Continue to react at 60r / min for 60min, wait until the oxidizing solution turns dark green until the pH value is 6, then introduce the chrome tanning solution into the middle tank 4 of the chrome tanning solution, let stand and age for 300min until the pH value is 8; the chrome tanning solution is sent to Enter the drying tower 6 for drying and dehydration at 110~1...

Embodiment 2

[0052] Select the montan wax of resin content2 Cr 2 o 7 +4H 2 SO 4 → Na 2 SO 4 + Cr 2 (SO 4 ) 3 +4H 2 O+3{O} Calculate the theoretical addition of sodium dichromate solution, according to the reaction formula 4Na 2 Cr 2 o 7 +12H 2 SO 4 +C 6 h 12 o 6 →8Cr(OH)SO 4 +4Na 2 SO 4 +6CO 2 ↑+14H 2 O Calculate the theoretical addition amount of glucose solution; take sodium dichromate solution according to the theoretical addition amount, get glucose solution according to 110% of the theoretical addition amount, and then slowly add in the modulation reaction kettle 3; start stirring, at 105 ~ 110 ° C, Continue to react at 70r / min for 120min, wait for the oxidizing solution to turn dark green until the pH value is 7, introduce the chrome tanning solution into the middle tank 4 of the chrome tanning solution, let stand and age for 480min until the pH value is 9; send the chrome tanning solution to Enter the drying tower 6 for drying and dehydration at 110~120°C un...

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Abstract

The invention discloses a method and device for producing a chromium tanning agent by using oxidized waste liquid obtained from S wax production. The method comprises the steps of carrying out acidification and two-stage oxidation on raw materials, namely lignite wax, sodium bichromate, chromic anhydride (chromium trioxide, CrO3) and sulfuric acid, so as to obtain the oxidized waste liquid; treating the oxidized waste liquid by using glucose serving as a reducing agent in a manner that glucose cooperates with sodium bichromate, so as to obtain a chromium tanning solution; drying and dewatering the chromium tanning solution, thereby obtaining the chromium tanning agent. The device comprises an oxidized waste liquid storage tank, an oxidized liquid reduction device, a chromium tanning agent recovery device, a high-position liquid supplying device and a supporting liquid distribution device. According to the method, the chromium tanning agent (alkaline chromic sulfate-chromium powder tanning agent) is prepared through reducing the chromium-containing oxidized waste liquid, formed during the production of S wax from lignite wax, by using glucose which cooperates with sodium bichromate, and tanned leather is plump, soft and elastic. According to the method and the device, the process is simple and energy-saving, the consumption of sulfuric acid and glucose is low, and the device is easy to implement, so that the large-scale, continuous and automated production can be realized.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and further belongs to the technical fields of montan wax deep processing and leather chemicals, and in particular relates to a method and a device for producing chrome tanning agent by using oxidized waste liquid produced from S wax. Background technique [0002] Montan wax and degreasing wax (including mildly oxidized wax-brown wax) are greatly affected and restricted in application due to their darker color and certain impurities (resin and asphalt); more than 80% of montan wax in the world Transforming into light-colored refined wax is the only way to upgrade products, improve the economics of enterprises, extend the industrial chain, and avoid low-level and low-value market competition of montan wax. Chromium preparations are often used for oxidation in the production of S wax, and the resulting oxidation waste liquid is often wasted due to the high recovery cost. In recent y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/06C01G37/08
Inventor 刘长胜罗国林
Owner QUJING ZHONGYI FINE CHEMICAL INDUSTRY CO LTD
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