Method for preparing sodium cyanide co-production mixed sulfate from waste residues generated by cracking light oil

A technology of light oil cracking and sodium cyanide, applied in the direction of metal cyanide, simple alkali metal cyanide, etc., can solve the problem of not completely eradicating waste residues, and achieve the effect of simple and easy-to-obtain equipment, simple preparation process, and eliminate pollution

Inactive Publication Date: 2011-01-26
汪晋强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the waste residue can meet the requirements of environmental protection, this method does not completely eradicate the CN in the waste residue. - , but only to control its c

Method used

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  • Method for preparing sodium cyanide co-production mixed sulfate from waste residues generated by cracking light oil
  • Method for preparing sodium cyanide co-production mixed sulfate from waste residues generated by cracking light oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The method for preparing sodium cyanide and co-producing mixed sulfate from light oil cracking waste residue comprises the following preparation steps:

[0028] Step A, put the waste residue obtained in the process of cracking the light oil into the product, put it into the washing tank 1, and use the sodium sulfate solution with a temperature of -10°C and a volume concentration of 5% to stir and wash it three times; each wash is half an hour;

[0029] Step B, filter the mixture after each washing in step A with filter 2;

[0030] Step C, the filter cake obtained by filtering in step B is sent to incineration;

[0031] Step D, the filtrate obtained by filtering three times in step B is sent together to carry out low-temperature distillation in the vacuum distiller-3, and the distillation temperature is 40° C.;

[0032] Step E, cooling the liquid distilled in step D through cooler-4 to obtain sodium cyanide crystal 5;

[0033] Step F, sending the remaining liquid in th...

Embodiment 2

[0035] The method for preparing sodium cyanide and co-producing mixed sulfate from light oil cracking waste residue comprises the following preparation steps:

[0036] Step A, put the waste residue obtained in the process of cracking the light oil into the product, put it into the washing tank 1, and use the sodium sulfate solution with a temperature of 0° C. and a volume concentration of 6% to stir and wash it three times; wash for half an hour each time;

[0037] Step B, filter the mixture after each washing in step A with filter 2;

[0038] Step C, the filter cake obtained by filtering in step B is sent to incineration;

[0039] Step D, the filtrate obtained by filtering three times in step B is sent together to carry out low-temperature distillation in vacuum distiller-3, and the distillation temperature is 45° C.;

[0040] Step E, cooling the liquid distilled in step D through cooler-4 to obtain sodium cyanide crystal 5;

[0041] Step F, sending the remaining liquid in ...

Embodiment 3

[0043] The method for preparing sodium cyanide and co-producing mixed sulfate from light oil cracking waste residue comprises the following preparation steps:

[0044] Step A, put the waste residue obtained in the process of cracking the light oil into the product, put it into the washing tank 1, and wash it three times with a sodium sulfate solution with a temperature of 5° C. and a volume concentration of 6%; each time for half an hour;

[0045] Step B, filter the mixture after each washing in step A with filter 2;

[0046] Step C, the filter cake obtained by filtering in step B is sent to incineration;

[0047] Step D, the filtrate obtained by filtering three times in step B is sent together to carry out low-temperature distillation in vacuum distiller-3, and the distillation temperature is 50° C.;

[0048] Step E, cooling the liquid distilled in step D through cooler-4 to obtain sodium cyanide crystal 5;

[0049] Step F, send the remaining liquid in the step E to the vac...

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Abstract

The invention relates to the technical fields of comprehensive treatment and utilization of waste residues generated by cracking light oil, in particular to a method for preparing sodium cyanide co-production mixed sulfate from the waste residues generated by cracking the light oil. The main technical scheme of the invention comprises the following steps of: washing the waste residues generated by cracking the light oil, with 5-10 percent of a sodium sulfate solution below 30 DEG C; subjecting the washed waste residues to suck filtration; then placing the washed waste residues into a vacuum distillatory for vacuum distillation at the low temperature of 40-60DEG C; cooling to obtain a sodium cyanide crystal; and re-distilling the residual liquid to obtain the mixed sulfate. According to the invention, the preparation process and equipment are simple and feasible and the cost is low; and the invention eliminates the influence on the environment and simultaneously creates products with certain economic value.

Description

technical field [0001] The invention relates to the technical field of comprehensive treatment and utilization of cyanide waste residue, in particular to a method for preparing sodium cyanide and co-producing mixed sulfate by using light oil cracking waste residue. technical background [0002] The light oil cracking method mainly uses light diesel oil mixed with ammonia to carry out the cracking reaction in an electric arc furnace, uses petroleum coke as a carrier, and uses nitrogen gas for airtight anti-oxidation. After generating hydrogen cyanide, absorb it with sodium hydroxide to produce sodium cyanide. It reacts as follows: [0003] C 6 h 14 +6NH 3 =6HCN+13H 2 ↑ [0004] HCN+NaOH=NaCN+H 2 o [0005] Due to incomplete collection or reaction, the waste residue produced by light oil cracking contains impurities mainly HCN and NaCN. After testing, the cyanide content of the tailing slag is 40-500 mg / kg. Due to its toxicity, cyanide Its production enterprises belon...

Claims

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Application Information

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IPC IPC(8): C01C3/10
Inventor 王嘉兴
Owner 汪晋强
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