System and method for increasing yield of p-xylene by utilizing carbon-rich natural gas

A paraxylene and natural gas technology, applied in the system field of increasing production of paraxylene, can solve the problems of natural gas loss, greenhouse gas emissions, energy consumption increase, etc., and achieve the effect of reducing energy consumption

Active Publication Date: 2020-08-21
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Natural gas CO is currently required under the delivery of commercial natural gas 2 The CO2 content in the South China Sea natural gas extracted from the South China Sea gas fields is not more than 3%. 2 The content is generally high, so part of the CO must be removed at sea 2 , it can be further used as natural gas. Most of the carbon dioxide removed at this stage is directly emitted, causing serious greenhouse gas emissions at the same time as the high separation cost; in addition, the separation of CO from natural gas 2 The process of decarbonization will inevitably increase energy consumption, and will also cause the loss of natural gas. Relevant research shows that in the process of natural gas decarbonization, the loss rate of natural gas is between 2.5% and 7%.

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  • System and method for increasing yield of p-xylene by utilizing carbon-rich natural gas

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Embodiment 1

[0063] This embodiment provides a system for increasing the production of p-xylene by utilizing carbon-rich natural gas, the system structure is as follows figure 1 As shown, the system includes sequentially connected methanol synthesis integrated unit I, methanol product separation unit II, methanol stripping unit III, toluene methanol alkylation reaction unit IV, three-phase separation unit V, toluene circulation unit VII and two Toluene separation and purification unit;

[0064] The inlet of the methanol synthesis integration unit I is connected with a feed pipeline, and the feed pipeline is divided into two branches, one is a carbon-rich natural gas pipeline, and the other is a feed carbon-hydrogen ratio reconciliation pipeline;

[0065] The methanol synthesis integrated unit I includes a sequentially connected reforming unit and a methanol preparation unit;

[0066] The methanol product separation unit II is provided with a crude methanol outlet and an unreacted hydrocar...

Embodiment 2

[0073] This embodiment provides a method for increasing the production of p-xylene by using carbon-rich natural gas. The method is to use the system for increasing the production of p-xylene by utilizing carbon-rich natural gas provided in Implementation 1. The method includes the following steps:

[0074] CO in the carbon-rich natural gas raw material in this example 2 The content is 20%, through the purification device, dehydration, heavy hydrocarbon separation, desulfurization and mercury removal and other purification treatments are carried out.

[0075] (1) Use 600kmol steam to purify the described carbon-rich natural gas raw material (composition CO 2 Content 20%, 80% CH 4 ) after the carbon-hydrogen ratio is reconciled, enter the methanol synthesis integrated unit I to carry out reforming reaction and methanol preparation reaction in sequence, the pressure of the reforming reaction is 5Mpag, the temperature is 1200 ° C, the product after the reforming reaction The mol...

Embodiment 3

[0080] This embodiment provides a method for increasing the production of p-xylene by using carbon-rich natural gas. The method is to use the system for increasing the production of p-xylene by utilizing carbon-rich natural gas provided in Implementation 1. The method includes the following steps:

[0081] CO in the carbon-rich natural gas raw material in this example 2 The content is 12.5%. After the purification device, dehydration, separation of heavy hydrocarbons, desulfurization and mercury removal are carried out.

[0082] (1) Use 375kmol water vapor to purify the described carbon-rich natural gas raw material of 1000kmol / h (composition CO 2 Content 12.5%, 87.5% CH 4 ) after the carbon-hydrogen ratio is reconciled, enter the methanol synthesis integrated unit I to carry out reforming reaction and methanol preparation reaction in sequence, the pressure of the reforming reaction is 3Mpag, the temperature is 900 ° C, the product after the reforming reaction The molar rati...

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Abstract

The invention provides a system and a method for increasing the yield of p-xylene by using carbon-rich natural gas. The system comprises a methanol synthesis integrated unit, a methanol product separation unit, a methanol steam stripping unit, a toluene and methanol alkylation reaction unit, a three-phase separation unit, a toluene circulation unit and a xylene separation and purification unit which are connected in sequence, wherein an inlet of the methanol synthesis integrated unit is connected with a feeding pipeline, the feeding pipeline is divided into two branches, one branch is a carbon-rich natural gas pipeline, and the other branch is a feeding carbon-hydrogen ratio blending pipeline. According to the system and the method, natural gas loss and carbon dioxide emission reduction are avoided, and energy conservation and consumption reduction are achieved; and meanwhile, high-value utilization of the carbon-rich natural gas with high-concentration CO2 content is realized, and theyield of p-xylene is increased while carbon emission is reduced.

Description

technical field [0001] The invention belongs to the field of p-xylene production, and relates to a production method of p-xylene, in particular to a system and method for increasing the production of p-xylene by using carbon-rich natural gas. Background technique [0002] The extensive use of fossil fuels has led to an increase in the carbon dioxide content in the atmosphere year by year, and the greenhouse effect has become more and more serious. The reduction and rational use of carbon dioxide emissions is no longer a purely social responsibility. How to realize the high-value comprehensive utilization of carbon dioxide is imminent. Carbon-rich natural gas occupies an important position in China's unconventional natural gas. How to reduce carbon dioxide emissions and realize effective utilization is a difficult problem that needs to be overcome. [0003] Aromatics is an important raw material for the production of synthetic fibers, and the core of its industrial chain is m...

Claims

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Application Information

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IPC IPC(8): C07C2/86C07C15/08C07C7/00C07C7/04C07C7/14C07C29/151C07C29/152C07C31/04
CPCC07C2/864C07C29/1518C07C29/152C07C7/005C07C7/04C07C7/14C07C15/08C07C31/04
Inventor 王江涛曲顺利鹿晓斌贺同强郭雷徐国峰王芳吴桐李飞飞
Owner CHINA NAT OFFSHORE OIL CORP
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