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Method for recovering molybdenum from molybdenum-containing catalyst raffinate

A catalyst and raffinate technology, which is applied in the field of waste liquid recovery, can solve the problems of high energy consumption, waste water and waste gas, etc., and achieve the effects of low energy consumption, reduction of waste water discharge, and improvement of recovery rate

Inactive Publication Date: 2018-05-15
南京新奥环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the existing recovery technology of ammonium molybdate-containing catalyst raffinate, which has the problems of high energy consumption, secondary pollution such as waste water and waste gas generation, the present invention provides a method for recovering molybdenum from molybdenum-containing catalyst raffinate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a method for recovering molybdenum from molybdenum-containing catalyst raffinate, which is obtained from the process of co-oxidation to produce propylene oxide, wherein the molybdenum content is 2.8%, and the recovery method includes The following steps:

[0031] Step a, slurrying the residual liquid containing ammonium molybdate catalyst and industrial wastewater, so that the heat value of the mixed solution obtained from slurrying is 4MJ / kg;

[0032] Step b. Boost the pressure of the mixed solution obtained from pulping to 22.1 MPa and then enter the supercritical oxidation reactor for supercritical oxidation reaction. The oxygen source of the supercritical oxidation reactor is liquid oxygen with a purity of 99.9%, and the gas-liquid reaction is obtained mixture;

[0033] Step c, cooling the gas-liquid mixture after the supercritical oxidation reaction to 100° C., reducing the pressure to 2.0 MPa, and then performing gas-liquid separation, an...

Embodiment 2

[0037]This embodiment provides a method for recovering molybdenum from molybdenum-containing catalyst raffinate, which is obtained from the process of co-oxidation to produce propylene oxide, wherein the molybdenum content is 1.6%, and the recovery method includes The following steps:

[0038] Step a, slurrying the residual liquid containing ammonium molybdate catalyst and industrial waste water, so that the heat value of the mixed solution obtained from slurrying is 6MJ / kg;

[0039] Step b. Boost the pressure of the mixed solution obtained from pulping to 25MPa and then enter the supercritical oxidation reactor for supercritical oxidation reaction. The oxygen source of the supercritical oxidation reactor is liquid oxygen with a purity of 99.9%, and the gas-liquid mixture is reacted ;

[0040] Step c, cooling the gas-liquid mixture after the supercritical oxidation reaction to 150° C., reducing the pressure to 2.5 MPa, and then performing gas-liquid separation, and performing...

Embodiment 3

[0044] This embodiment provides a method for recovering molybdenum from molybdenum-containing catalyst raffinate, which is obtained from the process of co-oxidation to produce propylene oxide, wherein the molybdenum content is 2.2%, and the recovery method includes The following steps:

[0045] Step a, slurrying the residual liquid containing the ammonium molybdate catalyst and industrial waste water, so that the heat value of the mixed solution obtained from slurrying is 5MJ / kg;

[0046] Step b. Boost the pressure of the mixed solution obtained from pulping to 30MPa and then enter the supercritical oxidation reactor for supercritical oxidation reaction. The oxygen source of the supercritical oxidation reactor is liquid oxygen with a purity of 99.9%, and the gas-liquid mixture is reacted ;

[0047] Step c, cooling the gas-liquid mixture after the supercritical oxidation reaction to 200° C., reducing the pressure to 3.5 MPa, and then performing gas-liquid separation, and perfo...

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Abstract

The invention relates to a method for recovering molybdenum from molybdenum-containing catalyst raffinate. The method comprises the steps that the raffinate is subjected to slurry mixing, supercritical oxidation reaction and gas-liquid separation to obtain mixed slurry containing molybdenum oxide, and the mixed slurry is subjected to solid-liquid separation and filter residue ammonia leaching to obtain leachate containing ammonium molybdate. The method specifically comprises the following steps of mixing the molybdenum-containing catalyst raffinate with water to obtain a mixed solution with the heat value of 4-6 MG / kg; conducting supercritical oxidation reaction after pressurizing the mixed solution to obtain a gas-liquid mixture; cooling the gas-liquid mixture and conducting gas-liquid separation after depressurization to obtain the mixed slurry containing molybdenum oxide, and conducting solid-liquid separation on the mixed slurry to obtain waste water and filter residues containingmolybdenum oxide; repeatedly leaching the filter residues obtained in the step c through an ammonia solution and then conducting solid-liquid separation to obtain the leachate containing the ammoniummolybdate. The method has the advantages that secondary hazardous waste is not generated, little molybdenum is lost in the recovery process, and the recovery rate is high; moreover, energy consumptionis low, and the treatment time is short.

Description

technical field [0001] The invention relates to the technical field of waste liquid recovery, in particular to a method for recovering molybdenum from molybdenum-containing catalyst raffinate. Background technique [0002] With the development of science and technology, the application of precious metal molybdenum in the fields of petrochemical, chemical raw material manufacturing, biomedicine manufacturing and environmental protection is becoming more and more extensive. The consequence of these extensive applications is a large consumption of molybdenum resources. Propylene oxide is an important organic chemical raw material. At present, the production technologies of propylene oxide mainly include chloropropanol method, co-oxidation method, cumene oxidation method, hydrogen peroxide direct oxidation method, etc., among which co-oxidation method is used to produce Propylene oxide technology needs to be carried out under the action of molybdenum-based catalysts. During the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/34
CPCC22B7/008C22B34/345Y02P10/20
Inventor 李超伟卢俊华马强狄昌淼
Owner 南京新奥环保技术有限公司