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A method for producing hydrocarbon mixtures by converting methanol in a two-step process in a fixed-bed adiabatic reactor

An adiabatic reactor and hydrocarbon mixture technology, which is applied in the coal chemical industry, can solve the problems of affecting technical economy, difficult to stabilize operation, increased cycle energy consumption, etc., and achieve convenient and reliable start-up operation, lower cycle ratio, and lower gas cycle ratio. Effect

Active Publication Date: 2019-01-25
SHANXI FEISHI TECH +2
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Problems solved by technology

The method described in this patent simplifies the process flow of methanol conversion to produce hydrocarbon products, and also solves the problems of difficult start-up and stable operation of the dimethyl ether conversion reactor. For the step of dimethyl ether, the heat released in the synthetic oil reactor increases, so the required cycle ratio is also larger, and the cycle energy consumption increases, which affects the technical economy of the process

Method used

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  • A method for producing hydrocarbon mixtures by converting methanol in a two-step process in a fixed-bed adiabatic reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] For the process flow diagram of the fixed-bed adiabatic reactor two-step method methanol conversion to produce hydrocarbon mixture in Example 1, refer to the attached figure 1 .

[0041] The inner diameter of dimethyl ether reactor 5 is 4000mm, and γ-Al is installed inside 2 o 3 The catalyst is 62.3 tons, the total height of the catalyst bed is 8000mm, and the height-to-diameter ratio of the total catalyst bed is 2.0.

[0042] A total of 3 synthetic oil reactors 7 are arranged. The inner diameter of the reactor is 4000mm. Each reactor is equipped with 31.5 tons of ZSM-5 molecular sieve catalyst, the total height of the catalyst bed is 4500mm, and a total of 94.5 tons of catalysts are loaded. Two are online and one is standby.

[0043] The whole system is purged with nitrogen, and the oxygen content is confirmed to be less than 0.5%, and the system pressure is controlled at 1.8MPa.

[0044] Turn on the circulation compressor to establish the nitrogen circulation of t...

Embodiment 2-3

[0049] With the condition of embodiment 1, adopt identical reactor, identical catalyst, catalyst loading amount is identical. Change the operating pressure of the reaction system, methanol mass space velocity, gas circulation ratio, catalyst bed inlet temperature and outlet temperature and other parameters. The operating parameters and technical indicators after embodiment 2-3 reaches steady state are shown in Table 1. Comparative example

[0050] The conditions are the same as in Example 2, but the valve that the outlet of the recycle compressor 15 leads to the pipeline 16 is closed, and no recycle gas passes through the dimethyl ether reactor. See Table 1 for the operating parameters and technical indicators of the comparative example after reaching a steady state.

[0051] Table 1 embodiment 1-3 and the main operation parameter and technical index of comparative example

[0052] Operating parameters and technical indicators

Example 1

Example 2

Example...

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Abstract

The invention provides a method for preparing a hydrocarbon mixture by means of two-step method methanol conversion through an adiabatic fixed-bed reactor. The method comprises the steps that a part of circulation gas is introduced into an inlet of a dimethyl ether conversion reactor; when a device is started for the first time, the dimethyl ether reactor is heated through the circulation gas, after the temperature of a catalytic bed layer reaches the initial reaction temperature, the methanol raw material is gradually introduced, and therefore stable starting operation of the device is achieved; the materials discharged from the dimethyl ether reactor enter an oil synthesizing reactor, and a mixture of C1-C11 hydrocarbons and water are generated; the mixture and water are subjected to further cooling and then enter an oil-water-gas three-phase separator; a gas-phase product obtained through separation serves as the circulation gas for circulation, process water is delivered outside for water treatment, and the oil-phase product is the hydrocarbon mixture. The method for preparing the hydrocarbon mixture by means of two-step method methanol conversion through the adiabatic fixed-bed reactor has the advantages that the circulation ratio is small, and circulation energy consumption is low.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry. The invention provides a method for preparing a hydrocarbon mixture by converting methanol in a fixed-bed adiabatic reactor in two steps. Background technique [0002] There are a large number of technical patents in methanol conversion to hydrocarbon mixture technology, such as US Patent 3931349, 3998899 is the patent of methanol conversion to hydrocarbon products published by Mobil Corporation in the early stage. These patents use a fixed-bed two-stage conversion process, in which the first stage The reaction is the dehydration of methanol to produce dimethyl ether. The first-stage outlet material, including a mixture of methanol, dimethyl ether and water, enters the second-stage reactor, and generates gasoline fraction products under the action of molecular sieve catalysts. [0003] The reaction of methanol conversion to produce hydrocarbon mixture is a strong exothermic reacti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/02
CPCC07C1/20C07C41/09C07C11/02C07C43/043
Inventor 李文怀李凯旋张庆庚李晓马英民崔晓曦范辉杨阎海师维安王海龙
Owner SHANXI FEISHI TECH
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