Nova Patents
EP0909804A2

A process for production of ethylene and propylene by catalytic pyrolysis of heavy hydrocarbons

Abstract

A catalytic pyrolysis process for production of ethylene and propylene from heavy hydrocarbons, comprises that heavy hydrocarbons are contacted with a pillared interlayered clay molecular sieve and/or phosphorus and aluminum or magnesium or calcium modified high silica zeolite having a structure of pentasil contained catalysts in a riser or downflow transfer line reactor in the presence of steam and catalytically pyrolysed at a temperature of 650°C to 750°C and a pressure of 0.15 to 0.4MPa for a contact time of 0.2 to 5 seconds, a weight ratio of catalyst to feedstock of 15:1 to 40:1 and a weight ratio of steam to feedstock of 0.3:1 to 1:1. The yields of ethylene and propylene by the present invention are over 18wt%.

Term

Term ended

Projected expiry passed 15 October 2018, 7.9 years ago.

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12 claims: 3 independent, 9 dependent

  1. 1
    A process for producing ethylene and propylene wherein heavy hydrocarbons are contacted with hot molecular sieve catalyst in a reactor in the presence of steam and catalytically pyrolysed, the reaction effluent, steam and spent catalyst are separated by rapid gas-solid separation system in the outlet of riser reactor, the reaction effluent is quenched and then separated to obtain ethylene and propylene containing gaseous products and liquid products, the spent catalyst is stripped by steam and then removed to a regenerator where it is contacted with an oxygen containing gas and is regenerated by coke burning off, the regenerated catalyst is stripped and then recycled to the reactor for reuse, wherein said heavy hydrocarbons are contacted with hot pillared interlayered clay molecular sieve and/or phosphorus and aluminum or magnesium or calcium modified high silica zeolite having a structure of pentasil containing catalyst in a riser or downflow transfer line reactor and catalytic pyrolysed at a temperature of 650°C to 750°C and a pressure of 0.15 to 0.4MPa, for a contact time of 0.2 to 5 seconds, a weight ratio of catalyst to feedstock of 15:1 to 40:1 and a weight ratio of steam to feedstock of 0.3:1 to 1:1.
  2. 9
    The process according to any of claims 4 to 8, wherein said high silica zeolite having a structure of pentasil is one selected from the group of high silica zeolites having a structure of ZSM-5, ZSM-8 or ZSM-11 type.
  3. 10
    The process according to any of claims 4 to 9, wherein said high silica zeolite having a structure of pentasil is prepared by using water glass, aluminum phosphate and inorganic acid as raw materials, and Y type zeolite as crystalline seeds, and crystallizing at 130 to 200°C for 12 to 60 hours.
Independent claims3