A method for producing hydrocarbon mixtures by one-step methanol conversion in a fixed-bed adiabatic reactor

Abstract

The invention discloses a method for preparing a hydrocarbon mixture by using one-step methanol conversion in an adiabatic fixed bed reactor. The method comprises the following steps: mixing a raw material methanol with process water from a separator, performing heat exchange with one part of material at the reactor outlet for gasifying, mixing with dried circulating gas, carrying out a reaction for preparing the hydrocarbon mixture based on methanol conversion in the adiabatic fixed bed reactor filled with a ZSM-5 molecular sieve catalyst; dividing the material at the outlet of the adiabatic fixed bed reactor into three parts, collecting the three parts together after heat exchange; performing further cooling, and feeding into an oil-water-gas three-phase separator; and separating to obtain an oil-phase product, namely the hydrocarbon mixture. The method disclosed by the invention has the advantages of small gas cycle ratio and low operating energy consumption and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to a method for preparing hydrocarbon mixture by one-step methanol conversion in a fixed-bed adiabatic reactor. 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 reaction. At 400 °C, the heat of reaction released per 1 kg of methanol converted i...

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Problems solved by technology

Although the method provided by this patent saves the energy consumption of the dry gas cycle, it may bring some other problems at the same time: ① Without a cycle compressor, it will be very difficult to start the device; Under certain circumstances, the methanol conversion reaction tends to generate more olefins, which leads to the state of gas not circulating, the content of olefins in the product hydrocarbons, especially C 3 、C 4 Higher olefin content, resulting in lower gasoline yield

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