Recovery process of ruthenium trichloride catalyst in trimethylpyruvic acid synthesis work procedure

A technology of ruthenium trichloride catalyst and waste ruthenium trichloride catalyst, which is applied in chemical recovery, preparation of ruthenium/rhodium/palladium/osmium/iridium/platinum compound, inorganic chemistry, etc. Enterprise production and operating costs and other issues to achieve the effect of avoiding energy consumption

Active Publication Date: 2017-09-15
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the domestic recovery technology of ruthenium trichloride is mostly alkali fusion method, which consumes a lot of energy in the process of incineration and alkali fusion, and produces a large amount of saline wastewater in the process of alkali fusion-acidification leaching, which increases the production and operation costs of enterprises

Method used

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  • Recovery process of ruthenium trichloride catalyst in trimethylpyruvic acid synthesis work procedure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] With 100 grams of spent ruthenium trichloride catalyst after being dried, pulverized, crossing 50 mesh sieves, add the mixed solution of 1000 grams of hydrochloric acid and methanol (the mass ratio of hydrochloric acid and methanol is 1: 1, wherein the solute mass fraction of hydrochloric acid is 30% ), stirred at 40°C for 5 hours, and centrifuged for solid-liquid separation;

[0023] Above-mentioned centrifugal filtrate is evaporated and recovered hydrochloric acid-methanol mixed solution by two-effect graphite evaporator, and residual ruthenium chloride hydrate is left in the evaporator;

[0024] The above-mentioned ruthenium chloride hydrate was vacuum-dried at 40°C and an absolute pressure of 10 Pa for 5 hours. After the system returned to normal pressure, it was dried at 80°C for 8 hours under the protection of a hydrogen chloride gas flow with a flow rate of 5 cubic meters per hour to recover anhydrous trichloride. Ruthenium.

[0025] Take 1 gram of the recovered...

Embodiment 2

[0035] 100 grams of spent ruthenium trichloride catalyst after being dried, pulverized and crossed 80 mesh sieves was added to the mixed solution of 500 grams of hydrochloric acid and methanol (the mass ratio of hydrochloric acid and methanol is 1:1, wherein the solute mass fraction of hydrochloric acid is 30% ), stirred at 50°C for 4 hours, and centrifuged for solid-liquid separation;

[0036] Above-mentioned centrifugal filtrate is evaporated and recovered hydrochloric acid-methanol mixed solution by two-effect graphite evaporator, and residual ruthenium chloride hydrate is left in the evaporator;

[0037] The above-mentioned ruthenium chloride hydrate was vacuum-dried at 45°C and an absolute pressure of 10Pa for 4 hours. After the system returned to normal pressure, it was dried at 90°C for 6 hours under the protection of a hydrogen chloride gas flow with a flow rate of 8 cubic meters per hour to recover anhydrous trichloride. Ruthenium.

[0038] After compounding 5 grams ...

Embodiment 3

[0042] With 100 grams of spent ruthenium trichloride catalysts after drying, pulverizing and crossing 100 mesh sieves, add a mixed solution of 200 grams of hydrochloric acid and methanol (the mass ratio of hydrochloric acid and methanol is 2:1, wherein the solute mass fraction of hydrochloric acid is 30% ), stirred at 60°C for 2 hours, and centrifuged for solid-liquid separation;

[0043] Above-mentioned centrifugal filtrate is evaporated and recovered hydrochloric acid-methanol mixed solution by two-effect graphite evaporator, and residual ruthenium chloride hydrate is left in the evaporator;

[0044] The above-mentioned ruthenium chloride hydrate was vacuum-dried at 50°C and an absolute pressure of 10Pa for 3 hours. After the system returned to normal pressure, it was dried at 100°C for 5 hours under the protection of a hydrogen chloride gas flow with a flow rate of 10 cubic meters per hour to recover anhydrous trichloride. Ruthenium.

[0045] After compounding 10 grams of ...

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Abstract

The invention relates to the technical field of three-waste treatment in chemical industry, in particular to a recovery process of a ruthenium trichloride catalyst in a trimethylpyruvic acid synthesis work procedure. The waste ruthenium trichloride catalyst is added into a solution and is heated and stirred; then, solid-liquid separation is performed; filter liquid is evaporated to obtain ruodium chloride hydrate; the ruodium chloride hydrate is subjected to heat insulation treatment in hydrogen chloride gas; great energy consumption and great waste water generating quantity of an alkali fusion method can be avoided. The recovered anhydrous ruodium chloride can be directly used in the trimethylpyruvic acid preparation work procedure after being compounded with kieselguhr.

Description

technical field [0001] The invention relates to the technical field of waste treatment in the chemical industry, in particular to a recovery process for a ruthenium trichloride catalyst in a trimethylpyruvate synthesis process. Background technique [0002] Mecitrione is a systemic selective herbicide. The agent is absorbed by the roots of weeds and conducts to the upper part of the transpiration flow. It exerts herbicidal activity mainly by inhibiting the photosynthesis of sensitive plants. After emergence, the leaves chlorotic, and finally nutrient depletion and death. It is suitable for a variety of broad-leaved weeds in field crops such as soybeans, potatoes, tomatoes, sugarcane, and corn, and also for some grass weeds. It is less effective against perennial weeds. [0003] Mecitrione belongs to the non-s-triazine herbicides among the triazine herbicides. It has high activity and moderate duration of effect. Mecitrione was first developed by Bayer Company in 1971, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G55/00
CPCY02P20/129Y02P20/584C01G55/005C01G55/001
Inventor 吕新宇邱滔石伟红刘通
Owner CHANGZHOU UNIV
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