CN102432417A - Concentrating method for preparing acetylene by partially oxidizing natural gas - Google Patents
Concentrating method for preparing acetylene by partially oxidizing natural gas Download PDFInfo
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- CN102432417A CN102432417A CN2010102951785A CN201010295178A CN102432417A CN 102432417 A CN102432417 A CN 102432417A CN 2010102951785 A CN2010102951785 A CN 2010102951785A CN 201010295178 A CN201010295178 A CN 201010295178A CN 102432417 A CN102432417 A CN 102432417A
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Abstract
The invention discloses a concentrating method for preparing acetylene by partially oxidizing natural gas. The method comprises a process for treating cracked gas with a pre-washing tower and a desorbing tower, and is characterized in that: a set of heating device is arranged between the pre-washing tower and the desorbing tower; and a gas carrying solvent discharged from the pre-washing tower is subjected to heating treatment and enters the desorbing tower. Due to adoption of the method, the temperature of the gas carrying solvent is raised before entering the desorbing tower, so that benzene and naphthalene in the gas carrying solvent are not crystalized in the desorbing tower, the problem of scaling of the desorbing tower is solved radically, the block resistance of the gas carrying solvent desorbing tower is greatly increased, pollution on the entire system is lowered, the running period of the entire concentrating device is increased, and the production load is prevented from being lowered.
Description
Technical field
The present invention relates to gas by partial oxidation of natural legal system acetylene technology, relate in particular to a kind of concentrating method of gas by partial oxidation of natural legal system acetylene.
Background technology
Gas by partial oxidation of natural legal system acetylene technology is at high temperature to be reacted by Sweet natural gas and oxygen, generates reacted gas, and reacted gas absorbs through the selectivity of solvent (N-Methyl pyrrolidone), in packing tower, is separated into three kinds of gaseous mixture: (H
2, CO etc.), thick acetylene, higher alkyne gas (HA), wherein higher alkyne gas mainly contains: M-C
3H
4, P-C
3H
4, C
4H
2, C
4H
4, C
4H
6, C
6H
6, C
10H
8Etc. macromolecular hydro carbons.Since in the higher alkyne molecule mostly at C
4More than, under pressure, variation of temperature situation, very easily generate polymkeric substance (form with solid-state exists in the system).Contain aromatic hydrocarbon such as benzene, naphthalene in the reacted gas, benzene, naphthalene are dissolved in solvent (NMP) back and under the lower situation of temperature, occur crystalline polamer easily.
The extracting and concentrating technology of gas by partial oxidation of natural legal system acetylene comprises reacted gas through prewashing tower, the main route of washing tower, acetylene stripper, desorption tower and vacuum column, could get into follow-up processing after the hot solvent that comes out from vacuum column will pass through cooling; Route such as Fig. 1 that reacted gas is handled through prewashing tower, desorption tower; Reacted gas after compressor boosts; Get into the prewashing tower of concentration unit; The absorption that reacted gas and tower top are come in the packing layer of prewashing tower bottom the solvent generation counter current contact of part acetylene, the benzene in the reacted gas, naphthalene and part higher alkyne gas are by solvent absorbing.The solution heat that produces in the dissolution process is removed through interchanger, and the solvent that removes behind the solution heat gets into prewashing tower bottom and reacted gas counter current contact once more, and benzene, naphthalene and higher alkyne in the solvent are reached capacity; This part absorption benzene, naphthalene and higher alkyne reach saturated solvent and are sent to the desorption tower middle part; Through two-layer filler and with the stripping gas counter current contact of coming at the bottom of the tower, acetylene and small portion higher alkyne gas are deviate from from solvent, what be accompanied by desorption process is solvent temperature decline; Benzene in the solvent, naphthalene crystallization occurs under cryogenic situation; Simultaneously cause the individual space fouling of random packing in the desorption tower down in the influence of higher alkyne polymeric, between filler individuality and the individuality also because of fouling links to each other, the random packing foulings formation phenomenon that " hardens " that is connected together in a large number; The decline that the voidage of the filler after hardening, specific surface area are all rapid; The circulation of whole tower descends serious, " tower is stifled " phenomenon occurs, and solvent can't arrive at the bottom of the tower.But those skilled in the art generally believe; The obstruction of desorption tower be since higher alkyne in desorption tower due to the polymerization, and the contriver finds that in practice it mainly is that benzene, naphthalene in the solvent crystallization occurs and follow the higher alkyne polymerization to cause desorption tower to stop up simultaneously under cryogenic situation.
Therefore; Tradition solves the desorption tower filler and hardens, and the method that improves its anti-blocking is that the filler of desorption tower is remodeled, and substitutes the Pall ring filler of former tower with new packing; Through improving the circulation of desorption tower; Anti-blocking to desorption tower has certain relative raising, and such solution has improved running cost, and the problem of above-mentioned benzene, naphthalene crystal and higher alkyne polymerization fouling still exists.
Summary of the invention
The object of the present invention is to provide a kind of concentrating method of gas by partial oxidation of natural legal system acetylene, use the inventive method, the anti-clogging of its desorption tower is good, the tower circulation steady, it is little to produce load.
The present invention is achieved in that
A kind of concentrating method of gas by partial oxidation of natural legal system acetylene; It is characterized in that: between prewashing tower and desorption tower, set up a cover heat riser; The absorption that the prewashing tower is come out the carrier gas solvent of benzene, naphthalene and higher alkyne gas carry out hyperthermic treatment, said solvent gets into desorption tower again.
Above-mentioned carrier gas solvent is to absorb benzene, naphthalene and higher alkyne gas to reach saturated carrier gas solvent.
Above-mentioned hyperthermic treatment is that above-mentioned carrier gas solvent temperature is risen to 50～55 ℃.
In order to control the temperature that the carrier gas solvent gets into desorption tower more accurately, between above-mentioned heat riser and desorption tower, temp probe is set.
Above-mentioned heat riser can adopt electrically heated heat riser, hot solvent heat riser etc., and in order to circulate, to utilize the energy reasonablely, the present invention preferably adopts the hot solvent heat riser, controls the temperature of the carrier gas solvent that gets into desorption tower through the flow of regulating hot solvent; Said hot solvent is the hot solvent that the vacuum column from the extracting and concentrating technology of gas by partial oxidation of natural legal system acetylene comes out.
Specifically, a kind of concentrating method of gas by partial oxidation of natural legal system acetylene is following:
The carrier gas solvent that dissolving benzene, naphthalene and the higher alkyne of prewashing tower bottom reaches capacity is sent in the hot solvent heat riser, and said high-temperature cleaning hot solvent is the hot solvent that the vacuum column from the extracting and concentrating technology of gas by partial oxidation of natural legal system acetylene comes out; The high-temperature cleaning hot solvent of said heat riser is as thermal source; Flow through control high-temperature cleaning hot solvent is regulated the temperature of controlling the carrier gas solvent; And on the carrier gas solvent line between said heat riser and the desorption tower, temp probe is set; The carrier gas solvent is sent into desorption tower middle part after being raised to 50～55 ℃, through two-layer filler and with the stripping gas counter current contact of coming at the bottom of the tower.
Beneficial effect of the present invention is following:
The inventive method has improved the temperature of carrier gas solvent before getting into desorption tower; Make benzene, naphthalene in the carrier gas solvent that crystallization no longer take place in desorption tower; Fundamentally solve the problem of desorption tower fouling, improved the anti-blocking of carrier gas solvent desorption tower greatly, reduced the pollution of total system; Improve the cycle of operation of whole concentration unit, avoided producing the reduction of load.Adopt concentrating method of the present invention, when every year desorption tower being cleaned, just finding has the thin dirty body of one deck at filling surface, cleans and can remove with water blast gun, and the filler after the cleaning can reuse; The filler turnover rate of prior art is to change every year once, and filler turnover rate of the present invention is to change once in per three or four years, has practiced thrift the expense that filler is changed greatly.
Description of drawings
Fig. 1: in the prior art in the extracting and concentrating technology of gas by partial oxidation of natural legal system acetylene reacted gas through the process flow sheet of prewashing tower, desorption tower treating part.
Fig. 2: reacted gas is through the process flow sheet of prewashing tower, desorption tower treating part in the extracting and concentrating technology of gas by partial oxidation of natural legal system acetylene of the present invention.Dotted line representes that the unlatching of valve controlled by temp probe among the figure.
Embodiment
Through embodiment the present invention is carried out concrete description below; Be necessary to be pointed out that at this following examples only are used for the present invention is further specified; Can not be interpreted as the restriction to protection domain of the present invention, the technician in this field can make some nonessential improvement and adjustment to the present invention according to the invention described above content.
Embodiment 1
A kind of concentrating method of gas by partial oxidation of natural legal system acetylene; May further comprise the steps: the carrier gas solvent that dissolving benzene, naphthalene and the higher alkyne that comes out from the prewashing tower bottom reaches capacity gets into the hot solvent heat riser, and the hot solvent in the said hot solvent heat riser is the hot solvent that the vacuum column from the extracting and concentrating technology of gas by partial oxidation of natural legal system acetylene comes out; Through heat riser the carrier gas solvent is heated up; On the carrier gas solvent line between said heat riser and the desorption tower, temp probe is set; Get into the desorption tower middle part after the carrier gas solvent is warmed up to 52 ℃, through two-layer filler and with the stripping gas counter current contact of coming at the bottom of the tower, as shown in Figure 2.
Embodiment 2
A kind of concentrating method of gas by partial oxidation of natural legal system acetylene; May further comprise the steps: the carrier gas solvent of dissolving benzene, naphthalene and the higher alkyne that comes out from the prewashing tower bottom gets into the hot solvent heat riser, and the hot solvent in the said hot solvent heat riser is the hot solvent that the vacuum column from the extracting and concentrating technology of gas by partial oxidation of natural legal system acetylene comes out; Through heat riser the carrier gas solvent is heated up, gets into the desorption tower middle part after the carrier gas solvent is warmed up to 50 ℃, through two-layer filler and with the stripping gas counter current contact of coming at the bottom of the tower.
Embodiment 3
A kind of concentrating method of gas by partial oxidation of natural legal system acetylene; May further comprise the steps: the carrier gas solvent that dissolving benzene, naphthalene and the higher alkyne that comes out from the prewashing tower bottom reaches capacity gets into the electrically heated heat riser; Through this heat riser the carrier gas solvent is heated up; On the carrier gas solvent line between said heat riser and the desorption tower, temp probe is set, gets into the desorption tower middle part after the carrier gas solvent is warmed up to 53 ℃, through two-layer filler and with the stripping gas counter current contact of coming at the bottom of the tower.
Embodiment 4
A kind of concentrating method of gas by partial oxidation of natural legal system acetylene; May further comprise the steps: the carrier gas solvent of dissolving benzene, naphthalene and the higher alkyne that comes out from the prewashing tower bottom gets into the electrically heated heat riser; Through this heat riser the carrier gas solvent is heated up; Get into the desorption tower middle part after the carrier gas solvent is warmed up to 55 ℃, through two-layer filler and with the stripping gas counter current contact of coming at the bottom of the tower, deviate from acetylene and small portion higher alkyne gas in the carrier gas solvent.
Press the concentrating method of embodiment 1, when every year desorption tower being cleaned, just finding has the thin dirty body of one deck at filling surface, cleans and can remove with water blast gun, and the filler after the cleaning can reuse.The filler turnover rate of desorption tower is to change once in per three or four years, has practiced thrift the expense that filler is changed greatly.
Claims (7)
1. the concentrating method of a gas by partial oxidation of natural legal system acetylene; Comprise that reacted gas is through prewashing tower, desorption tower treatment process; It is characterized in that: between prewashing tower and desorption tower, set up a cover heat riser, the carrier gas solvent that the prewashing tower comes out gets into desorption tower again after hyperthermic treatment.
2. the method for claim 1 is characterized in that: said carrier gas solvent is to absorb benzene, naphthalene and higher alkyne gas to reach saturated carrier gas solvent.
3. according to claim 1 or claim 2 method, it is characterized in that: said hyperthermic treatment is that said carrier gas solvent temperature is risen to 50～55 ℃.
4. method as claimed in claim 3 is characterized in that: between said heat riser and desorption tower, temp probe is set.
5. according to claim 1 or claim 2 method; It is characterized in that: said heat riser is electrically heated heat riser or hot solvent heat riser, and wherein the hot solvent in the hot solvent heat riser is the hot solvent that the vacuum column from the extracting and concentrating technology of gas by partial oxidation of natural legal system acetylene comes out.
6. method as claimed in claim 3; It is characterized in that: said heat riser is electrically heated heat riser or hot solvent heat riser, and wherein the hot solvent in the hot solvent heat riser is the hot solvent that the vacuum column from the extracting and concentrating technology of gas by partial oxidation of natural legal system acetylene comes out.
7. the method for claim 1; It is characterized in that: the carrier gas solvent that dissolving benzene, naphthalene and the higher alkyne that comes out from the prewashing tower bottom reaches capacity gets into the hot solvent heat riser, and the hot solvent in the said hot solvent heat riser is the hot solvent that the vacuum column from the extracting and concentrating technology of gas by partial oxidation of natural legal system acetylene comes out; Through heat riser the carrier gas solvent is heated up; On the carrier gas solvent line between said heat riser and the desorption tower, temp probe is set; Get into the desorption tower middle part after the carrier gas solvent is warmed up to 50～55 ℃, through two-layer filler and with the stripping gas counter current contact of coming at the bottom of the tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102951785A CN102432417A (en) | 2010-09-29 | 2010-09-29 | Concentrating method for preparing acetylene by partially oxidizing natural gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102951785A CN102432417A (en) | 2010-09-29 | 2010-09-29 | Concentrating method for preparing acetylene by partially oxidizing natural gas |
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| Publication Number | Publication Date |
|---|---|
| CN102432417A true CN102432417A (en) | 2012-05-02 |
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| CN2010102951785A Pending CN102432417A (en) | 2010-09-29 | 2010-09-29 | Concentrating method for preparing acetylene by partially oxidizing natural gas |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105473206A (en) * | 2013-07-18 | 2016-04-06 | 克洛诺普鲁斯技术股份公司 | Method and device for purifying exhaust air produced during wood processing |
| CN108218655A (en) * | 2016-12-21 | 2018-06-29 | 中国石化集团四川维尼纶厂 | The method that gas by partial oxidation of natural acetylene by-product higher alkyne recycles |
| CN109796295A (en) * | 2018-12-28 | 2019-05-24 | 青海盐湖工业股份有限公司 | A kind of natural gas pyrolysis acetylene concentration system and its technique |
| CN108218662B (en) * | 2016-12-21 | 2021-02-19 | 中国石化集团四川维尼纶厂 | Method for recovering high-grade alkyne in process of preparing acetylene by partial oxidation of natural gas |
-
2010
- 2010-09-29 CN CN2010102951785A patent/CN102432417A/en active Pending
Non-Patent Citations (4)
| Title |
|---|
| 四川化工研究院第二研究室: "天然气加压部分氧化制乙炔及乙炔的等压液氨提浓", 《石油化工》 * |
| 杨朝富 等: "天然气制乙炔工艺", 《聚氯乙烯》 * |
| 王梦远: "浅谈乙炔提浓装置中聚合物含量的控制", 《天然气化工》 * |
| 王森林: "乙炔提浓的压力与安全", 《化工设计》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105473206A (en) * | 2013-07-18 | 2016-04-06 | 克洛诺普鲁斯技术股份公司 | Method and device for purifying exhaust air produced during wood processing |
| CN105473206B (en) * | 2013-07-18 | 2017-06-30 | 克洛诺普鲁斯技术股份公司 | For cleaning the method and apparatus from the waste gas in timber processing |
| CN108218655A (en) * | 2016-12-21 | 2018-06-29 | 中国石化集团四川维尼纶厂 | The method that gas by partial oxidation of natural acetylene by-product higher alkyne recycles |
| CN108218662B (en) * | 2016-12-21 | 2021-02-19 | 中国石化集团四川维尼纶厂 | Method for recovering high-grade alkyne in process of preparing acetylene by partial oxidation of natural gas |
| CN108218655B (en) * | 2016-12-21 | 2021-03-19 | 中国石化集团四川维尼纶厂 | Method for recycling advanced alkyne as byproduct in preparation of acetylene by partial oxidation of natural gas |
| CN109796295A (en) * | 2018-12-28 | 2019-05-24 | 青海盐湖工业股份有限公司 | A kind of natural gas pyrolysis acetylene concentration system and its technique |
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Application publication date: 20120502 |