CN1111708C - Method for extracting concentrated hydrogen gas by utilizing separation of aqua compound - Google Patents
Method for extracting concentrated hydrogen gas by utilizing separation of aqua compound Download PDFInfo
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- CN1111708C CN1111708C CN 00100279 CN00100279A CN1111708C CN 1111708 C CN1111708 C CN 1111708C CN 00100279 CN00100279 CN 00100279 CN 00100279 A CN00100279 A CN 00100279A CN 1111708 C CN1111708 C CN 1111708C
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Abstract
The present invention is characterized in that the characteristic that hydrate and the precursor thereof have no selectivity to hydrogen is used for separating and extracting mixed gas containing hydrogen (such as, coal seam gas, ethylene cracking gas, hydrogen-contained refinery gas, hydrogenated tail gas, etc.), and a multi-stage separation technology is used for enhancing the concentration of final hydrogen so as to replace the existing membrane separation and pressure-change adsorption process. The present invention has the basic procedures that the mixed gas is fed into a hydration device to generate hydrates, wherein the gas difficult to generate hydrates is still in a gas state, and the gas easy to generate hydrates can be fed into a dissolving pool in the form of hydrates or the precursor thereof to be dissolved.
Description
Relate to the field
The present invention relates to a kind ofly be applicable to recovery, put forward dense technology, generate hydrate or its precursor comes the hydrogen in the hydrogeneous gas mixture is carried out separating and concentrating by utilizing such as hydrogen in coal-seam gas, refinery's splitting gas, hydrogeneous refinery gas or the hydrogenation tail gas.
Background technology
To produce hydrogen in the cracking of ethylene process, this is an important hydrogen source, general recovery method is: in the demethanizing cat head, the mixture of hydrogen and methane is realized separating of hydrogen and methane in very low temperature (-160 ℃ approximately) by ice chest, and this operation will consume a large amount of colds and use complicated compression, changes cold technology.
Also contain hydrogen partial in hydrogenation tail gas, oil refinery dry gas, the coal-seam gas, the technology of recover hydrogen had pressure swing adsorption and membrane separation technique in the past, and the former needs the logotype of 7-10 bed, the facility investment height, high material consumption, latter's working pressure are more than 15Mpa, and hydrogen dividing potential drop pressure reduction is more than 10Mpa, working pressure is higher, and energy consumption is big.
Summary of the invention
The objective of the invention is to: generate the bigger phenomenon of pressure difference based on the gas with various hydrate, generate hydrate or its precursor and come the hydrogen in the hydrogeneous gas mixture is carried out the method that separating and concentrating provides a kind of high efficiency, recover hydrogen that energy consumption is low by utilizing.
The present invention is achieved in that the method for utilizing hydrate separating and concentrating hydrogen, it is characterized in that: it is dense to utilize the method that generates hydrate or its precursor that hydrogen is carried from contain hydrogen mixture, separate, to contain hydrogen mixed gas and be-20 ℃-10 ℃ in temperature range, pressure is under the operational condition of 0.1-20MPa, making non-hydrogen generate hydrate exists with solid form, or generation hydrate precursor exists with liquid form, and can not generating hydrate, hydrogen still exists with the form of gas, pass through gas then, Gu after separating, the solid phase hydration materialization is separated and is realized gas delivery.
Hydrate is small molecules gas (N
2, CO
2, CH
4, C
2H
6, C
3H
8Deng) and a kind of crystalline substance of under certain temperature and pressure, generating of water, generally between 0 ℃ and 15 ℃, difference is very big with the difference of the gas that generates hydrate and generate pressure for the generation temperature of hydrate.During as 1 ℃, the generation pressure of methane is up to 30 normal atmosphere, and propane can generate hydrate below normal pressure, and the gas separation of hydrate just is being based on the gas with various hydrate and is generating realizing than big difference of pressure.
The hydrate precursor is meant that gas combines with water but do not reach the state of solid crystals as yet, and it still is liquid.
Utilize generating hydrate or its precursor, to come recover hydrogen be exactly to make other component in the gas mixture form hydrate and remove, and hydrogen can not form hydrate because molecule is too little.Because hydrate is zero to the selectivity of hydrogen, thereby can be with more than the hydrogen upgrading to 95% by an equilibrium stage.
The invention has the advantages that: absorption is compared with transformation, present technique can significantly improve the rate of recovery of hydrogen, reduce facility investment and materials consumption, compare working pressure and pressure falls and can reduce with membrane sepn, the isolating affected pressure of Hydrate Technology can be about 3MPA, pressure drop more than 0.1MPA, thereby cut down the consumption of energy.Can above zero finish with hydrate separating hydrogen gas and methane in the cracking of ethylene process, this can save a large amount of colds and number of compression stages, thereby increases economic efficiency.
Description of drawings
Fig. 1 utilizes hydrate to separate, carry the single-stage tripping device process schematic representation of dense hydrogen;
Fig. 2 utilizes hydrate to separate, carry the multi-stage separation device process schematic representation of dense hydrogen.
Concrete enforcement
The basic procedure of single equilibrium stage is: gas mixture at first enters in the hydrator, with the hydrator temperature at-20 ℃-10 ℃, pressure is under the 0.1-20Mpa condition, select concrete operational condition generally between light key ingredient (hydrogen) and heavy key (methane or ethene etc.) formation condition, make gas mixture be easy to generate the heavy key generation hydrate of hydrate and do not reach the condition that light key ingredient generates hydrate, so just can make the gas of hydration in hydrate or its precursor tangible difference be arranged, the awkward gas of hydrate and the hydrate of generation of generating of mixed gas separation in hydrator with the gas composition that does not generate hydrate.The hydrate that generates or its precursor flow into to dissolve in the pond to be dissolved by heating or step-down, and the water cycle after dissolving is returned hydrator, dissolves gas for easily generating the part of hydrate.
The basic procedure of many equilibrium stages is: adopt a plurality of equilibrium stages, the difficult gas that generates hydrate among the single-stage charging equilibrium stage A is entered next equilibrium stage B (operational condition and then change into the higher operational condition of selectivity) as charging, the difficult gas that generates hydrate returns in the charging of A equilibrium stage among the balance B, among the same equilibrium stage A the difficult gas that generates hydrate enter easily generate hydrate among the equilibrium stage C among the equilibrium stage C gas also as the charging of equilibrium stage A.Like this, just can utilize many equilibrium stages that the weight component is all had better selectivity.
Embodiment:
The basic procedure of single equilibrium stage:
Gas mixture at first enters hydrator, and hydrator temperature, pressure are controlled at respectively :-20 ℃-10 ℃, 0.1-20.0MPa.Mixed gas partly generates hydrate in hydrator, and remainder is product (hydrogen that contains high density).The hydrate that generates or its precursor flow into to dissolve utilizes heating or step-down to dissolve (general temperature is no more than 28 ℃, and pressure is lower than hydrator and gets final product) in the pond, the water cycle after dissolving is returned hydrator, and dissolving the gas that is byproduct (containing small quantity of hydrogen).
Example 1: operational condition: 3.0MPa, 1.0 ℃
| Mol percentage ratio | H 2 | CH 4 | C 3H 8 |
| Feeding gas is formed | 78.4178 | 13.3206 | 8.2615 |
| The immobilization composition of venting one's spleen | 5.8741 | 63.5567 | 30.5692 |
| Gas phase is formed | 88.1822 | 9.5629 | 2.2549 |
Example 2: operational condition: 4.0MPa, 1.0 ℃
| Mol percentage ratio | H 2 | CH 4 | C 3H 8 |
| Feed composition | 78.4178 | 13.3206 | 8.2615 |
| The immobilization composition of venting one's spleen | 31.7696 | 44.8745 | 23.3558 |
| Gas phase is formed | 92.9832 | 4.8369 | 2.1799 |
Example 3: operational condition: 20.0MPa, 10.0 ℃
| Mol percentage ratio | H 2 | CH 4 |
| Feed composition | 50.48 | 49.52 |
| The immobilization composition of venting one's spleen | 16.9 | 83.1 |
| Gas phase is formed | 98.70 | 1.30 |
Example 4: operational condition: 0.5MPa ,-5.0 ℃
| Mol percentage ratio | H 2 | CH 4 | C 3H 8 |
| Feed composition | 20.0 | 40.1 | 39.9 |
| The immobilization composition of venting one's spleen | 1.3 | 47.4 | 51.3 |
| Gas phase is formed | 82.3 | 15.1 | 2.6 |
Example 5: operational condition: 0.1MPa-20.0 ℃
| Mol percentage ratio | H 2 | CH 4 | C 3H 8 |
| Feed composition | 50.7 | 30.8 | 18.5 |
| The immobilization composition of venting one's spleen | 0.9 | 60.3 | 38.8 |
| Gas phase is formed | 93.1 | 5.7 | 1.2 |
The basic procedure of many equilibrium stages: adopt a plurality of equilibrium stages, gas phase among the single-stage A (charging equilibrium stage) is entered next equilibrium stage B (working pressure is higher or service temperature is lower) as charging, immobilization is vented one's spleen and is returned in the A equilibrium stage among the equilibrium stage B, reclaim light constituent, the operation of repetition equilibrium stage is satisfied product requirement up to gas phase.So just can utilize many equilibrium stages that the weight component is all had better selectivity.And among the equilibrium stage A immobilization to separate gas be byproduct (containing small quantity of hydrogen).
Present method can adopt different technical process to realize: hydrator can adopt fully mixing or multiple reactor such as tower, can adopt several different methods such as step-down or heating to dissolving the pond.
The dense hydrogen that is respectively applied in the splitting gas that produces in hydrogen in the hydrogeneous coal-seam gas, the hydrogen in the hydrogeneous refinery gas, the hydrogen in the hydrogenation technique circulation gas, the cracking of ethylene production process is separated, carried to the method that utilize to generate hydrate or its precursor.
Claims (2)
1. utilize the method for hydrate separating and concentrating hydrogen, it is characterized in that: the method that utilize to generate hydrate or its precursor make hydrogen from contain hydrogen mixture, carry dense, separate, to contain hydrogen mixed gas and be-20 ℃-10 ℃ in temperature range, pressure is under the operational condition of 0.1-20MPa, making non-hydrogen generate hydrate exists with solid form, or generation hydrate precursor exists with liquid form, and can not generating hydrate, hydrogen still exists with the form of gas, by after gas, the solid separation, the solid phase hydration materialization is separated and is realized gas delivery then.
2. the method for utilizing hydrate separating and concentrating hydrogen according to claim 1 is characterized in that: the dense hydrogen that is respectively applied in the splitting gas that produces in hydrogen in the hydrogeneous coal-seam gas, the hydrogen in the hydrogeneous refinery gas, the hydrogen in the hydrogenation technique circulation gas, the cracking of ethylene production process is separated, carried to the method that utilize to generate hydrate or its precursor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00100279 CN1111708C (en) | 2000-01-13 | 2000-01-13 | Method for extracting concentrated hydrogen gas by utilizing separation of aqua compound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00100279 CN1111708C (en) | 2000-01-13 | 2000-01-13 | Method for extracting concentrated hydrogen gas by utilizing separation of aqua compound |
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| Publication Number | Publication Date |
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| CN1272618A CN1272618A (en) | 2000-11-08 |
| CN1111708C true CN1111708C (en) | 2003-06-18 |
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| CN 00100279 Expired - Fee Related CN1111708C (en) | 2000-01-13 | 2000-01-13 | Method for extracting concentrated hydrogen gas by utilizing separation of aqua compound |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101530719B (en) * | 2008-03-13 | 2011-11-30 | 中国石油大学(北京) | Method and device for low-pressure processing of coal bed gas |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387691C (en) * | 2005-02-03 | 2008-05-14 | 石油大学(北京) | Method for generating aqua compound |
| CN101096908B (en) * | 2006-06-27 | 2011-08-31 | 上海标氢气体技术有限公司 | Two stage low pressure method for coal bed gas producing natural gas |
| CN109847555B (en) * | 2019-02-01 | 2021-07-27 | 常州大学 | Device and method for recovering multiple gases in catalytic dry gas based on hydrate method |
| CN113117503B (en) * | 2019-12-31 | 2023-04-07 | 中国石油化工股份有限公司 | System and method for separating mixed gas by energy-saving hydrate method |
-
2000
- 2000-01-13 CN CN 00100279 patent/CN1111708C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101530719B (en) * | 2008-03-13 | 2011-11-30 | 中国石油大学(北京) | Method and device for low-pressure processing of coal bed gas |
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| CN1272618A (en) | 2000-11-08 |
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