PRODUCTION OF PROPYLENE IN PROCESS OF PARAPHASE CRACKING OF CARBOHYDRATES, IN PARTICULAR ETHANE Russian patent published in 2010 - IPC C07C11/06 C07C6/04 C10G69/04 

FIELD: explosives.

SUBSTANCE: one of methods includes the following stages: a. steam-phase cracking of ethane or mainly ethane initial raw materials, containing 70% or more of ethane, with production of, thereby, cracking product, containing ethylene, hydrogen, ethane, methane, acetylene and C₃ and heavier carbohydrates; b. processing of mentioned cracking product in extraction section of ethylene plant, also removal of mentioned hydrogen, methane and C₃ and heavier carbohydrates from it and conversion of mentioned acetylene available in it mainly into ethylene with production of, thereby, cracking product exposed to processing, containing mainly ethylene and ethane, and also fractioning of specified cracking product that has been processed into C₂ fractioning column and production of ethylene fraction, consisting of chemical ethylene and characterized with level of ethylene content below 99% (vol.), and ethane fraction in the form of distillation residue; c. sending of specified ethane fraction in the form of distillation fraction for recycle to specified steam-phase cracking; d. performance of reaction by mechanism of dimerisation in dimerisation section for the first part of specified ethylene fraction with thereby production of butene-enriched flow; e. performance of reaction by metathesis mechanism in metathesis section between butene in specified flow enriched with butene, and the second part of specified ethylene fraction with thereby production of flow enriched with propylene, ethylene and ethane; f. separation of propylene from specified ethylene and ethane in specified flow enriched with propylene and g. sending of at least part of specified ethylene and ethane from specified flow enriched with propylene for recycle into mentioned C₂ fractioning plant. Besides invention is related to method for production of propylene from carbohydrate raw materials.

EFFECT: application of proposed methods makes it possible to improve and make process of propylene production from carbohydrate initial raw materials more profitable.

39 cl, 6 dwg