Method for preparing sodium thiocyanate by using desulphurization waste liquid of coke oven gas

A technology for desulfurization waste liquid and coke oven gas, which is applied in the directions of thiocyanic acid, climate sustainability, sustainable manufacturing/processing, etc., can solve the problems of product application limitation, poor selectivity, difficult processing, etc., and achieves low production cost, Low energy consumption and high economic value

Inactive Publication Date: 2009-12-09
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is: coke oven gas desulfurization waste liquid contains not only thiocyanate, but also anions such as thiosulfate, sulfate, and cyanide. When treated with D201 anion exchange resin, they will be enriched at the same time. , so the selectivity of this method is poor, and the ammonium thiocyanate (NH 4 SCN) contains a large amount of impurities, the purity is not high, and the product application is limited. The regeneration of D201 anion exchange resin will produce a large amount of waste liquid, which is difficult to handle and pollutes the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of method concrete steps of preparing sodium thiocyanate with coke oven gas desulfurization waste liquid are as follows:

[0031] (1) vacuum concentration

[0032] Using coke oven gas desulfurization waste liquid as raw material, pump the coke oven gas desulfurization waste liquid into the vacuum filter, carry out vacuum filtration under the conditions of temperature 40°C and vacuum degree 0.09MPa, and collect the filtrate and filter residue respectively . The filtrate is initially purified coke oven gas desulfurization waste liquid, which is used for the extraction in step (2)-②; the filter residue is mixed with fly ash and reused as building materials.

[0033] (2) Extraction

[0034] ① Preparation of extract

[0035] After the (1) step was completed, take tributyl phosphate (TBP) as extractant, by TBP: the volume ratio of sulfonated kerosene is the ratio of 1: 1, TBP is joined in sulfonated kerosene, stirs and mixes, just The TBP extract was prepared and s...

Embodiment 2

[0045] A kind of method concrete steps of preparing sodium thiocyanate with coke oven gas desulfurization waste liquid are as follows:

[0046] (1) vacuum concentration

[0047] Same as Example 1, wherein: the temperature of the vacuum filtration is 35° C., and the vacuum degree is 0.08 MPa.

[0048] (2) Extraction

[0049] ① Preparation of extract

[0050] Same as Example 1, wherein: the volume ratio of tributyl phosphate (TBP):sulfonated kerosene is 1:5.

[0051] ②Extraction

[0052] With embodiment 1, wherein: when stirring and extracting for the first time, the volume ratio of filtrate: TBP extract is 1: 3, and the stirring speed is 400r / min, and the extraction time is 9min, and the rotating speed of disc centrifuge is 10000r / min When stirring and extracting for the second time, the lower floor raffinate: the volume ratio of the TBP extract is 1: 2, and the standing stratification time after extraction is 5min; The rotating speed, extraction time and standing stratifi...

Embodiment 3

[0060] A kind of method concrete steps of preparing sodium thiocyanate with coke oven gas desulfurization waste liquid are as follows:

[0061] (1) vacuum concentration

[0062] Same as Example 1, wherein: the temperature of the vacuum filtration is 30° C., and the vacuum degree is 0.07 MPa.

[0063] (2) Extraction

[0064] ① Preparation of extract

[0065] Same as Example 1, wherein: the volume ratio of tributyl phosphate (TBP):sulfonated kerosene is 1:10.

[0066] ②Extraction

[0067] With embodiment 1, wherein: when stirring and extracting for the first time, the volume ratio of filtrate: TBP extract is 1: 5, and the stirring speed is 300r / min, and the extraction time is 8min, and the rotating speed of disc centrifuge is 8000r / min When stirring and extracting for the second time, the lower floor raffinate: the volume ratio of the TBP extract is 1: 3, and the standing stratification time after extraction is 4min; The rotating speed, extraction time and standing stratifi...

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PUM

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Abstract

The invention discloses a method for preparing sodium thiocyanate by using desulphurization waste liquid of coke oven gas, and belongs to the technical field of utilization of desulphurization waste liquid of the coke oven gas. The method comprises the following steps: using the desulphurization waste liquid of the coke oven gas as a raw material, firstly, filtering the waste liquid in vacuum, using tributyl phosphate to extract thiocyanate radicals in the waste liquid, then using sodium hydroxide solution to back-extract the extract, and finally concentrating and crystallizing the extract, and washing and drying the crystals to obtain sodium thiocyanate crystals. The method uses the desulphurization waste liquid of the coke oven gas to prepare a sodium thiocyanate product with the purity as high as 93 to 95 percent so as to change waste into valuable and makes full use of waste resources; and the method is simple, saves energy, has no three-waste discharge, is favorable for environmental protection, has low production cost and good economic benefit, and develops a new path for the utilization of the desulphurization waste liquid resources of the coke oven gas. The sodium thiocyanate product prepared by the method can be widely applied in the industries of medicaments, textile, printing and dyeing, pesticide, chemistry and the like.

Description

1. Technical field [0001] The invention belongs to the technical field of utilizing coke oven gas desulfurization waste liquid, in particular to a method for preparing sodium thiocyanate from coke oven gas desulfurization waste liquid by using tributyl phosphate (TBP) extractant. 2. Background technology [0002] Sodium thiocyanate (NaSCN) has a wide range of applications. It is used in the pharmaceutical industry for the separation of antibiotics; in the textile industry as a spinning solvent for polyacrylonitrile fibers; in the printing and dyeing industry as a dye dispersant, fabric dyeing agent, etc.; In the pesticide industry, it is used to manufacture fungicides, insecticides, herbicides, etc.; in the chemical industry, it is used as metal detectors such as silver and copper, and raw materials for the manufacture of thiourea. Therefore, the production and preparation of sodium thiocyanate has high economic value. [0003] During the coking process, about 30% to 35% of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/20
CPCY02P20/10
Inventor 陈林周小华桑鲁燕云芳张桂罗
Owner CHONGQING UNIV
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