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Device and process for preparing isobutylene by dehydrogenating isobutane

A technology of isobutene and isobutane, which is applied in the field of isobutane dehydrogenation to produce isobutene and product recovery, can solve environmental hazards and other problems, and achieve the effect of inhibiting coking reaction

Active Publication Date: 2015-01-07
青岛京齐新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chromium-based catalysts are more harmful to the environment, and the manufacture, use and recycling of catalysts have strict environmental protection requirements

Method used

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  • Device and process for preparing isobutylene by dehydrogenating isobutane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Raw material isobutane 2, diluent H 2 3 and H 2 O1 exchanges heat with the high-temperature stream from the dehydrogenation reactor through the cooling heat exchanger I9 and the steam generator 12, and then enters the heating furnace I14 to be heated to 610°C to obtain isobutane, H 2 and H 2 High temperature stream 15 of O mixture. Stream 15 enters the dehydrogenation reactor I16, set the pressure of the dehydrogenation reactor to 0.3MPa, and the gas space velocity to 2500h -1 , the reaction feed gas volume ratio is isobutane: hydrogen: water vapor = 1:0.5:1.5, under the action of the platinum series catalyst with Pt-Sn-K as the active component suggested by the patent CN102000593, part of the isobutane is removed Hydrogen forms isobutene. The stream coming out of the dehydrogenation reactor I16 enters the heating furnace II18 to heat the gas flow to 600°C and then enters the dehydrogenation reactor II20. The pressure of the dehydrogenation reactor II is set at 0.25...

Embodiment 2

[0072] Raw material isobutane 2, diluent H 2 3 and H 2 O1 exchanges heat with the high-temperature stream leaving the dehydrogenation reactor through the cooling heat exchanger I9 and the steam generator 12, and then enters the heating furnace I14 to be heated to 630°C to obtain isobutane, H 2 and H 2 High temperature stream 15 of O mixture. Stream 15 enters the dehydrogenation reactor I16, set the pressure of the dehydrogenation reactor to 0.5MPa, and the gas space velocity to 4000h -1 , the reaction feed gas volume ratio is isobutane: hydrogen: water vapor = 1:0.5:1.0, part of the isobutane is removed under the action of the platinum catalyst with Pt-Sn-K as the active component suggested by the patent CN102000593 Hydrogen forms isobutene. The stream coming out of the dehydrogenation reactor I16 enters the heating furnace II18 to heat the gas stream to 630°C and then enters the dehydrogenation reactor II20. The pressure of the dehydrogenation reactor II is set at 0.4 MPa...

Embodiment 3

[0082] Raw material isobutane 2, diluent H 2 3 and H 2 O1 exchanges heat with the high-temperature stream leaving the dehydrogenation reactor through the cooling heat exchanger I9 and the steam generator 12, and then enters the heating furnace I14 to be heated to 640°C to obtain isobutane, H 2 and H 2 High temperature stream 15 of O mixture. Stream 15 enters the dehydrogenation reactor I16, set the pressure of the dehydrogenation reactor to 0.35MPa, and the gas space velocity to 5000h-1 , the reaction feed gas volume ratio is isobutane: hydrogen: water vapor = 1:1:1, under the action of the platinum series catalyst with Pt-Sn-K as the active component suggested by patent CN102000593, part of the isobutane is removed Hydrogen forms isobutene. The stream coming out of the dehydrogenation reactor I16 enters the heating furnace II18 to heat the gas stream to 650°C and then enters the dehydrogenation reactor II20. The pressure of the dehydrogenation reactor II is set to 0.3 MPa ...

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Abstract

The invention relates a process for preparing isobutylene by dehydrogenating isobutane. The process is characterized in that H2 and steam are adopted and used as diluents, a loaded platinum dehydrogenation catalyst is adopted and used for performing dehydrogenation reaction on the isobutane in a static bed adiabatic reactor; after being subjected to heat exchange and cooling, a reaction product is separated and purified; the unreacted isobutane returns to a dehydrogenation reactor; in separating and refining of the product, light components, namely, H2 and C1-C3, are separated by the copious cooling method; the isobutane and the isobutylene are separated by the method of catalyzing and distilling to generate methyl tert-butyl ether (MTBE); and then the obtained MTBE is cracked to obtain the isobutylene. By adopting the process, H2 with purity more than 98% and a high-purity isobutylene product can be obtained; simultaneously, the consumption of raw materials can be effectively reduced, and the equipment investment and operation cost are decreased.

Description

technical field [0001] The invention relates to a device and process for dehydrogenating light hydrocarbons to olefins, more specifically, a device and process for producing isobutene from isobutane dehydrogenation and product recovery. Background technique [0002] Isobutene is an important chemical basic raw material. It is mainly used to prepare methyl tert-butyl ether (MTBE) as an antiknock agent for gasoline fuel, polymerize isobutylene (HBI), methyl methacrylate, etc. At present, the main source of isobutene is the by-product of catalytic cracking and steam cracking of naphtha to produce ethylene. 4 fraction. With the continuous growth of the isobutene derivatives market, the above-mentioned sources of isobutene can no longer meet the demand, and new isobutene production technologies are needed. [0003] Isobutane dehydrogenation is another route to obtain isobutene, which can make better use of isobutane resources with low direct use value but abundant sources. Is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/09C07C5/333
Inventor 宋金富王际东邵长丽屈一新
Owner 青岛京齐新材料科技有限公司
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