US 10,208,256 B2 · Method for preparing monocyclic aromatic compounds and long-chain olefin compounds from carbon dioxide-rich synthesis gas

Abstract

Disclosed is a method for directly synthesizing monocyclic aromatic compounds and long-chain olefin compounds from a carbon dioxide-rich synthetic gas and, specifically, a method for directly synthesizing monocyclic aromatic compounds and long-chain olefin compounds from a carbon dioxide-rich synthetic gas, the method comprising a step of preparing a C1-C15 short-chain hydrocarbon by Fischer-Tropsch (FT) synthesis and a step of preparing monocyclic aromatic compounds and long-chain olefin compounds by dehydrogenating the short-chain hydrocarbon products, and maximizing the yield of the short-chain hydrocarbon by using, as a synthetic gas to be used in FT synthesis, a carbon dioxide-rich synthetic gas in which the molar ratio of hydrogen, carbon monoxide and carbon dioxide is delimited to a specific range, and maximizing the yield of the monocyclic aromatic compounds or the long-chain olefin compounds by specifying the composition of a catalyst to be used in the dehydrogenation and the temperature and pressure condition.

Claims12

Dependent claims

A method for synthesizing monocyclic aromatic compounds and long-chain olefin compounds from a carbon dioxide-rich synthesis gas, the method comprises:

i) preparing a hydrocarbon by conducting a Fischer-Tropsch (FT) synthesis process in the presence of an iron-based catalyst using a carbon dioxide-rich synthesis gas with a CO2/(CO+CO2) molar ratio controlled within a range from 0.4 to 0.65 as a source material;
ii) separating a C1-C15 short-chain hydrocarbon from the hydrocarbon products;
and
iii) preparing C6-C12 monocyclic aromatic compounds and C6-C18 long-chain olefin compounds by dehydrogenating the C1-C15 short-chain hydrocarbon in the presence of a crystalline aluminosilicate-based catalyst, hydrogen and water,
wherein the crystalline aluminosilicate-based catalyst in the step iii) has a Si/Al molar ratio of 10-50 and comprises mesopores with a size of 10 nm or smaller and micropores with a size of 1-8 Å, and
wherein the crystalline aluminosilicate-based catalyst in the step iii) has a Brønsted acid site/Lewis acid site ratio of 0.1-3.2.

3 more elements

Dependencies are inferred from the claim text.

Method for preparing monocyclic aromatic compounds and long-chain olefin compounds from carbon dioxide-rich synthesis gas

Life of this patent

Method for preparing monocyclic aromatic compounds and long-chain olefin compounds from carbon dioxide-rich synthesis gas

Life of this patent

Abstract

Claims12