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Method for purifying and concentrating CO from calcium carbide furnace gas

A calcium carbide furnace gas and pre-purification technology, applied in the direction of carbon monoxide, carbide, calcium carbide, etc., can solve the problems of not meeting the purity requirements of CO gas, cyanide sewage treatment, etc., and achieve high reliability, high CO yield, and device running stable effect

Active Publication Date: 2012-08-08
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Both of the above two methods can only remove some harmful impurities in the calcium carbide furnace gas, and impurities such as sulfur, phosphorus, arsenic, and oxygen still exist, which cannot meet the purity requirements of the raw material CO gas required for carbonylation, and there are cyanides in the above methods sewage treatment problem

Method used

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  • Method for purifying and concentrating CO from calcium carbide furnace gas
  • Method for purifying and concentrating CO from calcium carbide furnace gas
  • Method for purifying and concentrating CO from calcium carbide furnace gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Table 1 Composition of raw calcium carbide gas

[0042] Component CO H 2 CO 2 N 2 O 2 CH 4 tar ∑ V％ 80 5.9 3.6 5.8 2.0 1.2 1.5

[0043] Table 2 Impurity components

[0044] Component dust moisture h 2 S Thiol COS CS 2 Thiophene NO x P 4 pH 3 H 3 HCN mg / Nm 3 1.5×10 5 8.7 500 140 240 3200 1.0 110 22 200 0.2 0.5

[0045] Pressure: 0.003MPa, feed gas flow: 1000Nm 3 / h

[0046] The high-temperature (400-800°C) calcium carbide furnace gas from the closed calcium carbide furnace is cooled by three jacketed air coolers in series, and the temperature drops to 230-270°C, enters the bag filter for dust removal, and then enters the coke remover, and After heat exchange, the temperature drops to 25°C, and the tar in it solidifies and precipitates out. The pressure of the gas after dedusting and decoking is about 0.005MPa. It is pressurized to 0.05MPa by the blower and e...

Embodiment 2

[0057] Table 4 Composition of raw calcium carbide gas

[0058] Component CO H 2 CO 2 N 2 O 2 CH 4 tar ∑ V％ 85.0 6.4 1.8 3.9 1.2 0.7 1.0

[0059] Table 5 impurity components

[0060] Component dust moisture h 2 S Thiol COS CS 2 Thiophene NO x P 4 pH 3 H 3 HCN mg / Nm 3 1.0×10 5 6.5 440 180 290 3500 1.0 80 18 150 0.3 0.3

[0061] Pressure: 0.005MPa, feed gas flow: 5000Nm 3 / h

[0062] The high-temperature (400-800°C) calcium carbide furnace gas from the closed calcium carbide furnace passes through the outer outlet pipe with fins to the ceramic filter. The working temperature of the ceramic filter is 300°C, and the filtration time of the ceramic filter is 5 minutes. For 1 minute, filter and backflush alternately. After passing through the ceramic filter, the dust content of the gas is reduced to 5-10mg / Nm 3 ;

[0063] The subsequent purification and CO purification ...

Embodiment 3

[0068] Table 7 Composition of raw calcium carbide gas

[0069] Component CO H 2 CO 2 N 2 O 2 CH 4 tar ∑ V％ 75.0 10.5 3.5 4.0 3.0 2.0 2.0

[0070] Table 8 Impurity Components

[0071] Component dust moisture h 2 S Thiol COS CS 2 Thiophene NO x P 4 pH 3 H 3 HCN mg / Nm 3 0.8×10 5 15 3600 120 230 3750 1.0 150 27 175 0.1 0.1

[0072] Pressure: 0.005MPa, feed gas flow: 10000Nm 3 / h

[0073] Calcium carbide furnace gas purification and CO purification methods are the same as in Example 1, except that the working temperature of the ceramic filter is 500°C; the temperature-swing adsorption system consists of 8 towers; the compressor is pressurized to 1.0MPa and enters the sulfur-resistant deoxidation system; sulfur-resistant catalytic The deoxidation temperature is 300°C and the space velocity is 5000h -1 ; Hydrolytic desulfurization temperature 200 ℃, space velocity 5000h ...

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Abstract

The invention discloses a method for purifying and concentrating CO from calcium carbide furnace gas and belongs to a tail gas purification method. The method provided by the invention respectively comprises the following steps of: raw material calcium carbide furnace gas dedusting, cooling and decoking, temperature swing adsorption and precleaning, supercharging, sulphur tolerant catalytic deoxygenation, hydrolysis desulfidation, acid gas removal, arsenic removal, fine desulphurization, fine deoxidation, drying, pressure swing adsorption and concentration of CO. The invention relates to a packaged technology for purifying and concentrating CO from calcium carbide furnace gas. The technology is suitable for industrial scale application and can be adopted to make calcium carbide furnace gas containing various impurities into high-purity CO gas which is suitable for CO raw material for carbonyl synthesis or other chemical production.

Description

technical field [0001] The invention belongs to a method for purifying industrial tail gas, in particular to a method for enriching CO from calcium carbide furnace gas. Background technique [0002] Calcium carbide is an important basic chemical raw material, the chemical name is calcium carbide, and the molecular formula is CaC 2 , Calcium carbide reacts with water to produce acetylene. Acetylene is the basic raw material in the organic synthesis chemical industry. It can synthesize a series of organic compounds and provide raw materials for industry, agriculture and medicine. [0003] The core equipment for calcium carbide production is calcium carbide furnace. From the principle and structure of calcium carbide production, calcium carbide furnace is divided into closed calcium carbide furnace and open calcium carbide furnace. In the production of calcium carbide, the carbon material and lime react to generate calcium carbide (calcium carbide) and CO. If the furnace cove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/18C01B31/32C01B32/40C01B32/942
Inventor 郑珩陈耀壮谭成波曾健石江廖炯曾旭毛震波马磊
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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