阅读说明：本技术 一种高纯正丁烷生产工艺 (Production process of high-purity n-butane ) 是由 徐德亨 闫伟峰 于 2021-04-15 设计创作，主要内容包括：本发明提供一种高纯正丁烷生产工艺,涉及化工技术领域。该种高纯正丁烷生产工艺,包括以下具体步骤：S1.将油田气井中开发出的液化气利用输气管道输送,待液化气输送至输气管道末端后利用加压泵将其压缩保存至储气罐中,使液化气在储气罐中液化冷却形成液化石油气；S2.将液化冷却后的液化石油气利用蒸馏法进行加工,从液化石油气中分离得到粗丁烷;S3.将上述从液化石油气中分离得到粗丁烷作为原料；利用气体输送管道导入精馏塔的塔顶中,通过将油田气井中开发出的液化气作为原料,并将其蒸馏分离后制得的丁烷,再采用精馏和分离吸附的方法对正丁烷进行深加工,从而可以制得更高纯度的正丁烷,从而使其整体的工作效率大大提高。(The invention provides a production process of high-purity n-butane, and relates to the technical field of chemical industry. The production process of the high-purity n-butane comprises the following specific steps: s1, conveying liquefied gas developed in an oil field gas well by using a gas transmission pipeline, compressing and storing the liquefied gas into a gas storage tank by using a pressure pump after the liquefied gas is conveyed to the tail end of the gas transmission pipeline, and liquefying and cooling the liquefied gas in the gas storage tank to form liquefied petroleum gas; s2, processing the liquefied and cooled liquefied petroleum gas by a distillation method, and separating crude butane from the liquefied petroleum gas, and S3, separating the crude butane from the liquefied petroleum gas to serve as a raw material; a gas conveying pipeline is used for guiding the liquefied gas generated in an oil field gas well into the top of the rectifying tower, the liquefied gas is used as a raw material, the butane is prepared after distillation and separation, and the n-butane is further processed by adopting a rectifying, separating and adsorbing method, so that the n-butane with higher purity can be prepared, and the integral working efficiency of the n-butane is greatly improved.)

1. A production process of high-purity n-butane is characterized by comprising the following steps: the method comprises the following specific steps:

s1, conveying liquefied gas developed in an oil field gas well by using a gas transmission pipeline, compressing and storing the liquefied gas into a gas storage tank by using a pressure pump after the liquefied gas is conveyed to the tail end of the gas transmission pipeline, and liquefying and cooling the liquefied gas in the gas storage tank to form liquefied petroleum gas;

s2, processing the liquefied and cooled liquefied petroleum gas by a distillation method, and separating crude butane from the liquefied petroleum gas;

s3, taking the crude butane obtained by separating the liquefied petroleum gas as a raw material, guiding the crude butane into the top of a rectifying tower by using a gas conveying pipeline, introducing hydrogen into the top of the rectifying tower, and then rectifying the crude butane raw material by using the rectifying tower;

s4, using the n-butane generated after rectification in the rectification tower as a raw material, and removing impurities by adsorption by using a molecular sieve adsorption bed filled with a 13X adsorbent;

s5, introducing the n-butane subjected to adsorption treatment by the 13X molecular sieve adsorption bed into an adsorption bed using a 5A molecular sieve as an adsorbent, performing secondary adsorption on impurities in n-butane gas by using the 5A molecular sieve adsorption bed, and performing secondary adsorption to obtain the high-purity n-butane.

2. The process for producing high-purity n-butane according to claim 1, wherein: the air tank in step S1 is a medium-large air tank.

3. The process for producing high-purity n-butane according to claim 1, wherein: the liquefied gas in step S1 is compressed by the pressurizing pump and then cooled by the condenser.

4. The process for producing high-purity n-butane according to claim 1, wherein: in step S3, after the crude butane was introduced into the top of the rectifying column, pure nitrogen gas was introduced into the top of the rectifying column.

5. The process for producing high-purity n-butane according to claim 1, wherein: the molecular sieve adsorption bed containing the 13X adsorbent in the step S4 and the 5A molecular sieve adsorption bed in the step S5 are both arranged in a double-layer structure.

6. The process for producing high-purity n-butane according to claim 1, wherein: the purity of n-butane obtained after the secondary adsorption in step S5 is not less than 99.5%.

Technical Field

The invention relates to the technical field of chemical industry, in particular to a production process of high-purity n-butane.

Background

The n-butane is colorless gas, oil field gas, wet natural gas and cracked gas all contain n-butane, which is inflammable, can form explosive mixture when mixed with air, has danger of combustion and explosion when meeting heat source and open fire, has violent reaction when contacting with oxidant, has gas density higher than air, can be diffused to a far place at a lower part, can be ignited and reburnt when meeting fire source, has slight unpleasant smell, is insoluble in water, is easily soluble in alcohol and chloroform, and can be used as solvent, refrigerant and organic synthetic raw material.

Because of abundant coal resources, high coke yield and sufficient supply of coking benzene serving as a downstream product in the coal chemical industry, the production and processing of the n-butane mainly adopt a benzene method, the liquefied petroleum gas resources are gradually and comprehensively utilized along with the rapid development and the improvement of the oil refining capacity of the petrochemical industry in China, and the technology for preparing the butane from the liquefied petroleum gas resources is rapidly developed.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a production process of high-purity n-butane, which solves the technical problem that the production and processing process for preparing n-butane by using liquefied petroleum gas is relatively laggard along with the rapid development and the improvement of oil refining capability of the petrochemical industry in China.

(II) technical scheme

In order to solve the technical problems, the invention adopts the following technical scheme: a production process of high-purity n-butane comprises the following specific steps:

s1, conveying liquefied gas developed in an oil field gas well by using a gas transmission pipeline, compressing and storing the liquefied gas into a gas storage tank by using a pressure pump after the liquefied gas is conveyed to the tail end of the gas transmission pipeline, and liquefying and cooling the liquefied gas in the gas storage tank to form liquefied petroleum gas;

s2, processing the liquefied and cooled liquefied petroleum gas by a distillation method, and separating crude butane from the liquefied petroleum gas;

s3, taking the crude butane obtained by separating the liquefied petroleum gas as a raw material, guiding the crude butane into the top of a rectifying tower by using a gas conveying pipeline, introducing hydrogen into the top of the rectifying tower, and then rectifying the crude butane raw material by using the rectifying tower;

s4, using the n-butane generated after rectification in the rectification tower as a raw material, and removing impurities by adsorption by using a molecular sieve adsorption bed filled with a 13X adsorbent;

s5, introducing the n-butane subjected to adsorption treatment by the 13X molecular sieve adsorption bed into an adsorption bed using a 5A molecular sieve as an adsorbent, performing secondary adsorption on impurities in n-butane gas by using the 5A molecular sieve adsorption bed, and performing secondary adsorption to obtain the high-purity n-butane.

Preferably, the gas storage tank in S1 is a medium-large gas storage tank, which is convenient for storing a large amount of liquefied petroleum gas and for later-stage unified processing.

Preferably, the liquefied gas in S1 needs to be cooled by a condenser after being compressed by the pressurizing pump, and the cooling of the liquefied gas is accelerated by the condenser, so that the cooling liquefaction of the gaseous liquefied gas can be accelerated, and the potential safety hazard caused by the excessively high pressurizing temperature can be greatly reduced.

Preferably, in S3, after the crude butane is introduced into the top of the rectifying tower, a suitable amount of pure nitrogen gas may be introduced into the top of the rectifying tower, and a suitable amount of pure nitrogen gas or pure hydrogen gas may be introduced into the top of the rectifying tower, so that the rapid diffusion of impurities in the rectifying tower may be prevented and the purity of n-butane may be improved.

Preferably, the molecular sieve adsorption beds containing the 13X adsorbent and the 5A molecular sieve adsorption beds in the S4 and the S5 are both required to be arranged in a double-layer structure, and the adsorption efficiency and the adsorption quality of the 13X molecular sieve adsorption beds and the 5A molecular sieve adsorption beds on various impurities in the n-butane can be greatly improved by arranging the molecular sieve adsorption beds containing the 13X adsorbent and the 5A molecular sieve adsorption beds in the double-layer structure.

Preferably, the purity of the n-butane obtained after the secondary adsorption in the S5 is not less than 99.5%.

(III) advantageous effects

The invention provides a production process of high-purity n-butane. The method has the following beneficial effects:

1. the production process of the high-purity n-butane can carry out multistage deep processing on butane by adopting a processing process combining rectification and separation adsorption, thereby greatly improving the extraction efficiency and quality of the n-butane and greatly improving the overall working efficiency.

2. According to the production process of the high-purity n-butane, liquefied gas developed in an oil field gas well is used as a raw material, the liquefied gas is distilled and separated to prepare the butane, and the butane is further processed by adopting a rectification and separation adsorption method, so that the n-butane with higher purity can be prepared.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

The embodiment of the invention provides a production process of high-purity n-butane, which comprises the following specific steps:

s1, conveying liquefied gas developed in an oil field gas well by using a gas transmission pipeline, compressing and storing the liquefied gas into a gas storage tank by using a pressure pump after the liquefied gas is conveyed to the tail end of the gas transmission pipeline, and liquefying and cooling the liquefied gas in the gas storage tank to form liquefied petroleum gas;

s2, processing the liquefied and cooled liquefied petroleum gas by a distillation method, controlling the distillation temperature to be-40-35 ℃, and separating the liquefied petroleum gas to obtain crude butane with the purity of 90%, wherein the crude butane comprises 98.2% of n-butane, 0.63% of isobutane, 0.32% of propane, 0.05% of propylene and 0.8% of butylene in percentage by volume;

s3, taking the crude butane with the purity of 90 percent obtained by separating the liquefied petroleum gas as a raw material, guiding the crude butane into the top of a rectifying tower by using a gas conveying pipeline, introducing hydrogen into the top of the rectifying tower, and then rectifying the crude butane raw material by using the rectifying tower;

s4, using the n-butane generated after rectification in the rectification tower as a raw material, and adsorbing and removing impurities by using a molecular sieve adsorption bed filled with a 13X adsorbent, wherein 99.3-99.8% of olefin is adsorbed;

s5, introducing the n-butane subjected to adsorption treatment by the 13X molecular sieve adsorption bed into an adsorption bed using a 5A molecular sieve as an adsorbent, performing secondary adsorption on impurities in the n-butane gas by using the 5A molecular sieve adsorption bed, wherein the adsorption bed using the 5A molecular sieve as the adsorbent has different ratios of adsorbed components to corresponding balance components in a gas phase in the adsorption phase, and impurity components which are difficult to adsorb than the n-butane easily enter the gas phase in the process of pressure reduction desorption, so that the high-purity n-butane is obtained after secondary adsorption in the final stage of expansion desorption.

The gas storage tank in the S1 is a medium-large gas storage tank which is convenient for storing a large amount of liquefied petroleum gas and is convenient for later-stage unified processing.

The liquefied gas in the S1 needs to be cooled by a condenser after being compressed by a pressurizing pump, and the cooling of the liquefied gas is accelerated by the condenser, so that the cooling liquefaction of the gaseous liquefied gas can be accelerated, and the potential safety hazard caused by overhigh pressurizing temperature can be greatly reduced.

In S3, after the crude butane is introduced into the top of the rectifying column, pure nitrogen is introduced into the top of the rectifying column, and pure nitrogen or pure hydrogen is introduced into the top of the rectifying column, whereby rapid diffusion of impurities in the rectifying column can be prevented and the purity of n-butane can be improved.

The molecular sieve adsorption beds containing the 13X adsorbent and the 5A molecular sieve adsorption beds in the S4 and S5 are both required to be arranged in a double-layer structure, and the adsorption efficiency and the adsorption quality of the 13X molecular sieve adsorption beds and the 5A molecular sieve adsorption beds on various impurities in the n-butane can be greatly improved by arranging the molecular sieve adsorption beds containing the 13X adsorbent and the 5A molecular sieve adsorption beds in the double-layer structure.

The n-butane prepared by the method is subjected to content measurement in three batches, and the content is 99.5%, 99.6% and 99.6% respectively.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.