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Method for removing hydrogen sulfide and hydrogen cyanide from calcium carbide furnace gas

A calcium carbide furnace gas, sodium cyanide technology, applied in separation methods, chemical instruments and methods, hydrogen cyanide preparation/purification/separation, etc., can solve the problem that sodium cyanide and sodium sulfide solutions cannot be directly discharged and the processing cost is high problems, to achieve the effect of improving resource utilization, increasing economic benefits, and reducing production costs

Inactive Publication Date: 2009-05-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] Solutions with high content of sodium cyanide and sodium sulfide cannot be discharged directly, and chemical methods such as chlorination or sulfur dioxide-air are required for treatment, and the treatment cost is too high

Method used

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  • Method for removing hydrogen sulfide and hydrogen cyanide from calcium carbide furnace gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Calcium carbide furnace gas after dedusting, main chemical components volume %: CO=82, H 2 = 7, CO 2 = 2, O 2 = 2,N 2 =6, HCN=3000mg / Nm 3 , H 2 S=900mg / Nm 3 , at 5000m 3 / h speed passes through two series-connected absorption towers equipped with polypropylene fillers, and is connected with a 180-200m from top to bottom 3 The 18% NaOH solution sprayed at the speed of / h is in reverse contact, the lye enters from the second tower and exits from the first tower, and the mixed solution containing sodium sulfide and sodium cyanide at 20-22% and the purified tail gas can be obtained. Detect HCN in exhaust gas≤50mg / Nm 3 , H 2 S≤50mg / Nm 3 , to meet the requirements of carbon-chemical raw material gas; then the mixed solution is concentrated in a WZI I500 double-effect concentrator at 80-90°C for 25-30 minutes to obtain a mixed solution with a sodium sulfide and sodium cyanide content of 65-70%, Place in a vacuum concentration crystallizer at room temperatu...

Embodiment 2

[0025] Example 2: Calcium carbide furnace gas after dedusting, main chemical components wt%: CO=82, H 2 = 8, CO 2 = 1, O 2 = 2,N 2 =6, HCN=2000mg / Nm 3 , H 2 S=600mg / Nm 3 , at 2000~4000m 3 The speed of / h passes through two series-connected absorption towers equipped with polypropylene packing, and the distance from top to bottom is 150-180m 3 The 16% NaOH solution sprayed at the speed of / h is in reverse contact, the lye enters from the second tower and exits from the first tower, and the mixed solution containing sodium sulfide and sodium cyanide at 20wt% and the purified tail gas can be obtained, and the HCN in the tail gas is detected≤ 50mg / Nm 3 , H 2 S≤50mg / Nm 3 , to meet the requirements of carbon-chemical raw material gas; then the mixed solution is concentrated in WZI I500 double-effect concentrator at 90°C for 25 minutes, at this time, the content of sodium sulfide and sodium cyanide in the mixed solution reaches 66%, and it is placed in a vacuum concentration...

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Abstract

The invention relates to a method for purifying the acetylene and side product, wherein it comprises that: feeding acetylene into stuff tower, using 15-20wt% NaOH solution to reversely spray and wash to remove the hydrogen sulfide and hydrocyanic acid, to obtain purified tail gas and the mixture with sodium sulfide and sodium cyanide; evaporating, crystallizing, separating to obtain their mixture crystal; extracting the crystal with carbinol, separating the sodium sulfide and sodium cyanide; then evaporating the sodium cyanide carbinol solution, to recycle the carbinol, to obtain the sodium sulfide and sodium cyanide crystals. The invention can recycle sodium sulfide and sodium cyanide and reduce the pollution, while the sulfur and phosphor contents in tail gas are both lower than 50mg / Nm3.

Description

[0001] 1. Technical field: The present invention relates to a method for purifying calcium carbide furnace gas and recovering by-products, belonging to the field of chemical purification of calcium carbide furnace gas. 2. Background technology: [0002] In the production of calcium carbide, the closed calcium carbide furnace produces 400Nm of furnace gas per ton of calcium carbide 3 , a closed calcium carbide furnace with a capacity of 25500KVA produces a furnace gas volume of about 2500Nm 3 / h. When the calcium carbide furnace produces calcium carbide, since the reaction is a reduction reaction at high temperature, the impurities in the furnace gas mainly exist in the reduced state. Phosphorus in pH 3 , sulfur with H 2 S, nitrogen exists in forms such as HCN. [0003] Carbon-chemical products have high requirements on the purity of raw materials, and the purity, yield and yield of these raw materials are closely related to the level of CO concentration, so the requirement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/52B01D53/54B01D53/79C01C3/04C01C3/10
Inventor 宁平殷在飞马林转
Owner KUNMING UNIV OF SCI & TECH
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