CN102556964A - Formamide tail gas recovery and integral utilization process - Google Patents
Formamide tail gas recovery and integral utilization process Download PDFInfo
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- CN102556964A CN102556964A CN201210011729XA CN201210011729A CN102556964A CN 102556964 A CN102556964 A CN 102556964A CN 201210011729X A CN201210011729X A CN 201210011729XA CN 201210011729 A CN201210011729 A CN 201210011729A CN 102556964 A CN102556964 A CN 102556964A
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- gas
- tail gas
- hydrogen
- utilization process
- methane amide
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Abstract
The invention belongs to the field of chemical industrial waste gas recovery and particularly relates to a formamide tail gas recovery and integral utilization process, which comprises the following steps that: firstly, formamide tail gas is pressurized to 1.0 to 1.5Mpa through a hydrogen compressor; then, the tail gas enters a heat exchange to be heated to 200 to 400 DEG C; next, the tail gas enters a conversion furnace to be decomposed into carbon monoxide and hydrogen gas; then, the obtained gas is added into an oxygenation conversion furnace to be further converted into carbon monoxide, carbon dioxide and hydrogen gas; next, the obtained mixed gas passes through the conversion furnace for converting the carbon monoxide into the carbon dioxide, and the temperature of the conversion furnace is controlled at 380 to 450 DEG C; and finally, the carbon dioxide in the mixed gas is removed through methyl di ethanol amine (MDEA) solution, so the hydrogen gas is obtained through separation. The formamide tail gas recovery and integral utilization process adopting the technical scheme has the advantages that the pollution is little, in addition, the recovery and utilization can be realized, and the economic benefits and the environment benefits are high.
Description
Technical field
The invention belongs to chemical emission and reclaim the field, be specifically related to a kind of methane amide tail gas recycle comprehensive utilization process.
Background technology
Methane amide has active reactivity and special dissolving power, can be used as the organic synthesis raw material, paper treating agent, and the softening agent of fiber industry, the tenderizer of gelatin is also as the analytical reagent of measuring aminoacids content in the rice.In organic synthesis, the purposes of medical aspect is in the majority, and a lot of purposes are also being arranged aspect agricultural chemicals, dyestuff, pigment, spices, the auxiliary agent.Methane amide also is good organic solvent, is mainly used in the spinning and ion exchange resin of acrylonitrile copolymer, and covering with paint of the anti-electrostatic of plastics or conduction covering with paint etc., so the demand of methane amide is huge.
The huge production amount of methane amide makes that the tail gas arrangement amount of its production process is also very huge, is rich in 85～95% hydrogen in the tail gas of methane amide, and remainder is mainly compositions such as methyl alcohol, methyl formate.For the processing of this part tail gas, traditional mode is that its gas firing that acts as a fuel is used, but because the calorific value of hydrogen is low, has only 10779MJ/m
3, than the price of hydrogen, obvious this processing mode is wasted very much, because other impurity in combustion processes, can be emitted pungent smell, pollutes local environment in addition, and this methane amide vent gas treatment mode also is difficult for promoting.
Summary of the invention
It is little that the technical problem that the present invention will solve provides a kind of pollution, and the methane amide tail gas recycle comprehensive utilization process that can recycle.
In order to solve the problems of the technologies described above, the present invention provides a kind of methane amide tail gas recycle comprehensive utilization process, includes following steps:
1) at first at normal temperatures with methane amide tail gas through hydrogen compressor pressurization 1.0～1.5Mpa;
2) tail gas gets into interchanger and is heated to 200～400 ℃ then;
3) tail gas after the heating gets into receiver and resolves into carbon monoxide and hydrogen;
4) gas that obtains of a last step reaction gets into the oxygenation receiver, further is converted into carbon monoxide, carbonic acid gas and hydrogen;
5) mixed gas that obtains is converted into carbonic acid gas through shift converter with carbon monoxide again, and the shift converter temperature is controlled at 380～450 ℃;
6) last mixed gas removes carbonic acid gas through MDEA solution, obtains hydrogen thereby separate.
Reaction equation in the above-mentioned steps 3 is: HC00CH
3=2CO+2H
2
Reaction equation in the above-mentioned steps 4 is: HC00CH
3=2CO+2H
2
HC00CH
3+O
2=2CO
2+2H
2
Adopt the methane amide tail gas recycle comprehensive utilization process of technique scheme to have following advantage: through this process step; Methyl alcohol in the tail gas and methyl-formiate the like waste finally all are converted into carbonic acid gas; Hydrogen and carbonic acid gas are separated in MDEA solution, and wherein hydrogen can be used as the raw material of producing synthetic ammonia, and the purity of carbonic acid gas can reach 99%; Can further be processed into the food carbonic acid gas and sell or be used as protection-gas welding; Pollute for a short time, realized exhaust gas utilization, so economic benefit and environmental benefit are all higher.
As preferred version, in order to reduce the energy consumption of hydrogen compressor, and guarantee pressure demand, limit the step 1) control pressure at 1.3Mpa.
As preferred version, in order to reduce the input cost of interchanger, and satisfy the demand of subsequent reactions, limit step 2 to temperature) described in interchanger be gas-gas heat exchanger, temperature is heated to 300 ℃.
As preferred version,, limit step 5) shift converter temperature and be controlled at 410 ℃ for the conversion effect that cuts down the consumption of energy and guarantee to react.
Embodiment
EmbodimentIt is a kind of in order to solve the problems of the technologies described above that the present invention provides, and the present invention provides a kind of methane amide tail gas recycle comprehensive utilization process, includes following steps:
1) at first at normal temperatures with methane amide tail gas through the hydrogen compressor 13Mpa that pressurizes;
2) tail gas gets into gas-gas heat exchanger and is heated to 300 ℃ then;
3) tail gas after the heating gets into the following reaction of receiver generation: HC00CH
3=2CO+2H
2, decompose generation carbon monoxide and hydrogen;
4) gas that obtains of a last step reaction gets into the oxygenation receiver, and reaction: HC00CH as follows takes place
3=2CO+2H
2HC00CH
3+ O
2=2CO
2+ 2H
2, further be converted into carbon monoxide, carbonic acid gas and hydrogen;
5) mixed gas that obtains is converted into carbonic acid gas through shift converter with carbon monoxide again, and the shift converter temperature is controlled at 410 ℃;
6) last mixed gas removes carbonic acid gas through MDEA solution, obtains hydrogen thereby separate.
According to the actual demand of reaction, the pressure of hydrogen compressor can be controlled at 1.0～1.5Mpa in the step 1;
In the step 2 then tail gas get into gas-gas heat exchanger and can control Heating temperature at 200～400 ℃;
Can the shift converter temperature be controlled at 380～450 ℃ in the step 5.
Through the carbonic acid gas that the MDEA solution separating obtains, purity can reach 99%, can further be processed into food-grade carbon-dioxide and sell perhaps directly as protection-gas welding.The hydrogen that obtains through the MDEA solution separating can directly be used to produce the virgin gas of synthetic ammonia.
Above-described only is preferred implementation of the present invention; Should be understood that; For a person skilled in the art, under the prerequisite that does not break away from process thought of the present invention, can also make some distortion and improvement; These also should be regarded as protection scope of the present invention, and these can not influence effect and practical applicability that the present invention implements.
Claims (4)
1. methane amide tail gas recycle comprehensive utilization process is characterized in that including following steps:
At first at normal temperatures with methane amide tail gas through hydrogen compressor pressurization 1.0～1.5Mpa;
Tail gas gets into interchanger and is heated to 200～400 ℃ then;
Tail gas after the heating gets into receiver and resolves into carbon monoxide and hydrogen;
The gas that a last step reaction obtains gets into the oxygenation receiver, further is converted into carbon monoxide, carbonic acid gas and hydrogen;
The mixed gas that obtains is converted into carbonic acid gas through shift converter with carbon monoxide again, and the shift converter temperature is controlled at 380～450 ℃;
Last mixed gas removes carbonic acid gas through MDEA solution, obtains hydrogen thereby separate.
2. methane amide tail gas recycle comprehensive utilization process according to claim 1, it is characterized in that: the step 1) control pressure is at 1.3Mpa.
3. methane amide tail gas recycle comprehensive utilization process according to claim 1 and 2 is characterized in that: step 2) described in interchanger be gas-gas heat exchanger, temperature is heated to 300 ℃.
4. methane amide tail gas recycle comprehensive utilization process according to claim 3 is characterized in that: step 5) shift converter temperature is controlled at 410 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210011729XA CN102556964A (en) | 2012-01-16 | 2012-01-16 | Formamide tail gas recovery and integral utilization process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210011729XA CN102556964A (en) | 2012-01-16 | 2012-01-16 | Formamide tail gas recovery and integral utilization process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102556964A true CN102556964A (en) | 2012-07-11 |
Family
ID=46403798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210011729XA Pending CN102556964A (en) | 2012-01-16 | 2012-01-16 | Formamide tail gas recovery and integral utilization process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102556964A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004002186A (en) * | 2002-05-13 | 2004-01-08 | Boc Group Inc:The | Gas recovery method |
| EP1648817A1 (en) * | 2003-07-28 | 2006-04-26 | Uhde GmbH | Method for extracting hydrogen from a gas containing methane, especially natural gas and system for carrying out said method |
| CN101273112A (en) * | 2005-06-14 | 2008-09-24 | 南非煤油气科技（私人）有限公司 | Process for the preparation and conversion of synthesis gas |
-
2012
- 2012-01-16 CN CN201210011729XA patent/CN102556964A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004002186A (en) * | 2002-05-13 | 2004-01-08 | Boc Group Inc:The | Gas recovery method |
| EP1648817A1 (en) * | 2003-07-28 | 2006-04-26 | Uhde GmbH | Method for extracting hydrogen from a gas containing methane, especially natural gas and system for carrying out said method |
| EP1648817B1 (en) * | 2003-07-28 | 2006-10-25 | Uhde GmbH | Method for extracting hydrogen from a gas containing methane, especially natural gas and system for carrying out said method |
| CN101273112A (en) * | 2005-06-14 | 2008-09-24 | 南非煤油气科技（私人）有限公司 | Process for the preparation and conversion of synthesis gas |
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Application publication date: 20120711 |