Process of synthesizing gasoline and coproducting aromatic hydrocarbon by synthetic gas

Abstract

A kind of synthesis gas synthetic gasoline co-production aromatics technology is to mix methanol synthesis and methanol dehydration catalysts into a slurry bed reactor; ZSM-5 catalyst into a fixed bed reactor, under normal pressure, feed dilute hydrogen ( H2 / N2) performs temperature-programmed reduction on the catalyst in the slurry bed, and the reduction exhaust gas preheats the fixed-bed catalyst. Synthesis gas, in 3.0~7.0MPa, reaction temperature in slurry bed: 260~300℃, gas space velocity: 30000~120000h-1 reaction, reaction product enters fixed bed at equal pressure, fixed bed reaction temperature 300~400℃, gas Space velocity: The synthesis reaction is carried out under the condition of 10000~40000h-1. The invention has the advantages of high gas velocity, good heat transfer, on-line replacement of catalyst, equal pressure operation and low equipment investment.

Description

technical field [0001] The invention relates to a process for synthesizing gasoline and co-producing aromatics, in particular to a process for synthesizing high-quality gasoline and co-producing aromatics from synthesis gas through methanol and dimethyl ether. Background technique [0002] The direct conversion of syngas to gasoline is an important way to develop alternative energy sources. The oil synthesized from syngas through the F-T process has a wide carbon number distribution, contains straight-chain aliphatic hydrocarbons, oxygenated compounds and a small amount of aromatics, and has a very low octane number, so it cannot be used as motor gasoline without reforming. However, the gasoline synthesized by the process of methanol and dimethyl ether has a low carbon number, C 5 -C 11 Accounting for 70%, (the content of isomeric hydrocarbons reaches more than 35%). Therefore, the gasoline synthesized by this kind of process can reach 95 octane number without treatment, a...

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Problems solved by technology

The one-stage catalyst has the disadvantage of being easily deactivated, and the heat transfer effect of the fixed bed is not good, which can easily cause the sintering of the methanol catalyst; the dehydration of methanol to generate dimethyl ether is a strong exothermic reaction, and the fixed bed reactor must be multi-stage, which will inevitably cause Increased investment in equipment