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A process for preparing aromatics from methanol in a fixed bed

A technology of fixed bed and methanol, applied in the direction of hydrocarbon production from oxygen-containing organic compounds, carbon compound catalysts, organic chemistry, etc., can solve the problems of high yield of low-carbon olefins, low yield of aromatic products, etc., and reduce operating energy consumption , Improve economy, reduce the effect of circulating air volume

Active Publication Date: 2019-04-02
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the condition of adopting the mixed feed of methanol and water, the methanol conversion reaction tends to produce more olefins, which leads to a higher yield of low-carbon olefins in the product, and a lower yield of the desired aromatic products

Method used

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  • A process for preparing aromatics from methanol in a fixed bed
  • A process for preparing aromatics from methanol in a fixed bed
  • A process for preparing aromatics from methanol in a fixed bed

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A 2-stage fixed-bed reactor process flow is adopted.

[0033] The preparation of the catalyst in reactor R1 takes place first. Concentrated sulfuric acid and aluminum sulfate are used to prepare aqueous solution A, wherein the mass ratio of water to concentrated sulfuric acid and aluminum sulfate is 1:0.036:0.011. Water glass, n-butylamine, and sodium hydroxide are used to prepare aqueous solution B, wherein the mass ratio of water to water glass, n-butylamine, and sodium hydroxide is 1:0.457:0.045:0.008. Under stirring conditions, an equal volume of solution A was added dropwise to solution B, and stirring was continued at room temperature for 24 h. Under airtight conditions, the temperature was raised to 120°C, and the stirring was continued for 1 hour, then the temperature was raised to 180°C, and the stirring was continued for 36 hours. The reaction kettle was taken out, and the product was filtered, washed until neutral, and dried to obtain ZSM-5 sodium molecular...

Embodiment 2、3

[0036] A 2-stage fixed-bed reactor process is adopted. The catalyst preparation method adopted in the reaction is the same as that of Example 1, and the specific preparation conditions are shown in Attached Table 1. Process is identical with embodiment 1 in the reaction process, and concrete process condition sees attached table 2. The mass content of each component of the reaction product is shown in Attached Table 3.

Embodiment 4

[0038] A 3-stage fixed-bed reactor process flow is adopted, and the reaction flow is as follows figure 2 . The catalyst preparation method adopted in the reaction is the same as that of Example 1, and the specific preparation conditions are shown in Attached Table 1. During the reaction process, methanol is heated by preheater 1 to become raw material gas, which is divided into 3 parts, and enters buffer tank 2, buffer tank 5 and buffer tank respectively through pipelines p1, p2 and p10 with a volume ratio of 1:1.2:1.4 9. The tail gas circulation gas enters the buffer tank 2 at the same time, the circulation gas and the raw material gas are mixed at a ratio of 1:6.1, and enter the reactor R1 through the pipeline p3, the inlet temperature is 400°C, the inlet pressure is 2MPa, and the space velocity is 40000h -1 , the height-to-diameter ratio of the R1 bed is 1:1.1, the reacted gas enters the waste heat boiler 6 through the pipeline p4, and then enters the buffer tank 5 to mi...

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Abstract

The invention relates to a process for preparing aromatic hydrocarbon from methanol by virtue of a fixed bed. Methanol raw material gas is divided into two or three parts and is respectively processed by virtue of a two-level reactor or a three-level reactor in a serial-parallel combination manner, so that the flow ratio of circulating gas to raw material gas is decreased, and the total equipment investment and corresponding energy consumption in the reaction process are greatly reduced.

Description

technical field [0001] The invention belongs to a process for preparing aromatics from methanol, in particular to a process for preparing aromatics by using methanol as a raw material through series-parallel fixed-bed reactors. Background technique [0002] Aromatics such as benzene, toluene, and xylene are widely used in fields such as energy, transportation, materials, daily chemicals, and pesticides. Their industrial production mainly uses petroleum as raw material through aromatics complexes. The development of a process route that uses coal as raw material to produce aromatics through syngas and methanol can effectively reduce the dependence of the aromatics preparation process on petroleum resources, and has good economic value. It is one of the hot research areas of coal chemical industry. core of the process. [0003] The conversion of methanol to aromatics is a strongly exothermic reaction. If the reaction heat cannot be removed in time, it will easily cause the ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C15/02
CPCC07C1/20C07C2529/40C07C15/02
Inventor 刘平张侃吉可明荀家瑶高俊华宋清文
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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