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A system for producing olefins and a method for producing olefins using coal and refinery dry gas as raw materials

A refinery dry gas and olefin production technology, applied in the field of olefin production system, can solve the problems affecting the industrialization process of FTO process, low energy efficiency of FTO process, low utilization rate of carbon atoms, etc., so as to facilitate the promotion of industrialization and reduce energy consumption , the effect of reducing emissions

Active Publication Date: 2019-07-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its main problems are: 1. High energy consumption and low utilization rate of carbon atoms; 2. Carbon dioxide emissions are 5 to 6 times that of traditional petroleum routes; because the distribution of Fischer-Tropsch synthesis products is subject to the Anderson-Schulz-Flory law (chain growth is exponential (decreasing molar distribution), and subject to the large amount of methane and carbon dioxide generated by the strong exothermic reaction, the overall energy efficiency of the FTO process is low, which seriously affects the industrialization process of the FTO process

Method used

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  • A system for producing olefins and a method for producing olefins using coal and refinery dry gas as raw materials
  • A system for producing olefins and a method for producing olefins using coal and refinery dry gas as raw materials
  • A system for producing olefins and a method for producing olefins using coal and refinery dry gas as raw materials

Examples

Experimental program
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Effect test

Embodiment approach

[0061] In the above-mentioned supported catalyst, the carrier is θ-alumina containing a modifier, and compared with the θ-alumina not containing a modifier, the CO of the θ-alumina containing a modifier is 2 - TPD desorption temperature higher than that of theta-alumina without modifier 2 - TPD desorption temperature. Therefore, in the present invention, the performance of θ-alumina before and after modification can be expressed as CO 2 - Characterization of TPD, CO 2 -TPD means theta-alumina to CO 2 The desorption temperature is high, and the high temperature indicates that theta-alumina has a strong alkalinity, which is conducive to the desorption of light olefins. in CO 2 - In the TPD spectrum, the position of the peak temperature and the size of the peak area indicate the alkalinity of θ-alumina, CO 2 The high desorption peak temperature and large peak area indicate that θ-alumina has a strong basicity, which is beneficial to the desorption of olefins. According to a...

Embodiment 1

[0121] This embodiment is used to illustrate the system and method provided by the present invention.

[0122] (1) System construction

[0123]The coal-water slurry preparation unit I, coal gasification unit II, water-gas shift unit III, synthesis gas purification unit IV, Fischer-Tropsch synthesis unit V and olefin separation unit VI are connected in sequence, and the carbon dioxide outlet of the Fischer-Tropsch synthesis unit V and the The carbon dioxide outlet of the synthesis gas purification unit IV is connected with the carbon dioxide inlet of the methane dry reforming unit VII, the methane outlet of the refinery dry gas separation unit VIII and the methane outlet of the Fischer-Tropsch synthesis unit V are both connected with the methane inlet of the methane dry reforming unit VII The outlet of the synthesis gas of the methane dry reforming unit VII is connected with the inlet of the synthesis gas of the Fischer-Tropsch synthesis unit V through a delivery pipeline. The...

Embodiment 2

[0135] This embodiment is used to illustrate the system and method provided by the present invention.

[0136] (1) System construction

[0137] The system was constructed in the same manner as in Example 1.

[0138] (2) Preparation of Fischer-Tropsch synthesis catalyst

[0139] a. Preparation of carrier

[0140] Take commercially available 100-300 mesh γ-Al 2 o 3 Carrier (Sasol product) 200g was calcined at 980°C for 2h to prepare θ-alumina carrier, the BET properties of which are shown in Table 1. Weigh 37.0g of magnesium nitrate and dissolve it in 60g of deionized water to make a modified magnesium solution, add the modified magnesium solution to 100.0g of the above-mentioned carrier after roasting, stir evenly for 5min, let it stand for 2h, put it in an oven and dry it at 200°C for 3h , calcined at 800° C. for 1 h to prepare a modified carrier Z2 with a Mg content of 6 wt % in terms of metal elements and based on the weight of the modified carrier. its CO 2 The desor...

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Abstract

The invention relates to a system for preparing olefin by taking coal and refinery dry gas as raw materials and a method for preparing olefin by taking the coal and the refinery dry gas as the raw materials through the system. The system comprises a coal water slurry preparation unit, a coal gasification unit, a synthesis gas purification unit and a Fischer-Tropsch synthesis unit which are sequentially connected; a carbon dioxide outlet of the Fischer-Tropsch synthesis unit and / or a carbon dioxide outlet of the synthesis gas purification unit communicates with a carbon dioxide inlet of a methane dry-reforming unit, a methane outlet of a refinery dry gas separation unit communicates with a methane inlet of the methane dry-reforming unit, or the methane outlet of the refinery dry gas separation unit and a methane outlet of the Fischer-Tropsch synthesis unit both communicate with the methane inlet of the methane dry-reforming unit. According to the system for preparing olefin by taking the coal and the efinery dry gas as the raw materials, two greenhouse gases including carbon dioxide and methane are simultaneously utilized to be converted into a product with the high additional value, greenhouse gas emission is reduced, and the resource and energy utilization rate of the whole technology is significantly increased.

Description

technical field [0001] The invention relates to a system for producing olefins by using coal and refinery dry gas as raw materials, and a method for producing olefins by using coal and refinery dry gas as raw materials. Background technique [0002] Olefin is an important basic chemical raw material in the production of chemical industry, and it is also a symbol to measure the development level of a country's petrochemical industry. It is estimated that by 2015, my country's ethylene production capacity will be 27.5 million tons, and the domestic support capacity will be 64%. It is estimated that by 2015, my country's propylene production capacity will be 24 million tons, and the domestic support capacity will be 77%. At present, the methods for preparing low-carbon olefins can be divided into three categories according to raw materials: petroleum route, natural gas route and coal route. The method of light oil cracking, that is, the petroleum route to produce low-carbon ol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/04C07C11/02C07C9/04C01B3/34
CPCC01B3/346C07C1/0485C07C11/02C07C9/04
Inventor 晋超吴玉夏国富张荣俊孙霞侯朝鹏李明丰杨清河
Owner CHINA PETROLEUM & CHEM CORP