Method for continuously producing epoxypropane by propane two-step method

Abstract

The invention discloses a method for continuously producing epoxypropane by using a propane two-step method. Cheap propane, water and air are used as raw materials for continuously preparing an epoxypropane product with a high additional value. In order to ensure the supply of a hydrogen raw material and a propylene raw material, hydrogen with 946-17028 standard cubic meters per hour can be produced by 100% methanol / methane cracking as a supplement, and the yield of propylene is increased by 0%; and 0% of methanol / methane can be cracked to produce hydrogen, and the yield of propylene per year is 100% increased by 1.73-30.84 ten thousand tons and is delivered to the outside, so that the requirement of balance of hydrogen and propylene materials is met. The propylene selectivity is improved to 86.28-89.93%, the epoxypropane selectivity is improved to 96.66-98.95%, the purity of the epoxypropane product is greater than or equal to 99.95 wt%, the chromaticity is less than or equal to 5, the aldehyde acid is less than or equal to 0.008 wt%, the water is less than or equal to 0.02 wt%, the quality indexes of the epoxypropane product all meet the national standard, and a better technical effect is achieved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for continuously producing propylene oxide by a two-step propane method. Background technique [0002] The preparation of propylene oxide PO by the cumene CHPPO method is to generate cumene hydroperoxide CHP through the reaction of cumene CUM and oxygen in the air, and cumene hydroperoxide CHP reacts with propylene epoxidation to generate propylene oxide PO and α, α-dimethylbenzyl alcohol DMBA, α, α-dimethylbenzyl alcohol DMBA is dehydrated to generate α-methyl styrene, and α-methyl styrene is hydrogenated to generate cumene CUM for recycling. [0003] The invention patent application number in the prior art is CN200710010674.X The device for the direct oxidation of propane and molecular oxygen to prepare propylene oxide, which discloses that in the annular space formed by the double-layer glass medium, the propane molecules are under the action of high-energ...

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Problems solved by technology

The invention patent application number in the prior art is CN201810699480.3. The methanol used as the solvent is changed to propylene oxide raw material, and the consumption is huge. When producing propylene oxide products, a large amount of aromatics or ethylene and propylene are co-produced, and the products are in the market. Medium sales are inflexible, and it is difficult to improve the selectivity of propylene oxide with existing technologies

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