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Energy saving method for butadiene preparation by butylene oxydehydrogenation

A technology for oxidative dehydrogenation and butadiene, which is applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc. The effect of obvious technological progress

Active Publication Date: 2014-08-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem mainly solved by the present invention is the problem of large water vapor consumption and high energy consumption existing in the prior art

Method used

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  • Energy saving method for butadiene preparation by butylene oxydehydrogenation
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  • Energy saving method for butadiene preparation by butylene oxydehydrogenation

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A 100,000 tons / year butene oxidative dehydrogenation to butadiene plant adopts figure 1 The process technology, the reactor is two-stage, and the two-stage reactor is an adiabatic radial fixed-bed reactor, using 36000 kg / h N 2 Mixed gas with 20,000 kg / h of water vapor is used as the diluent, the total amount of raw material butene is 19,670 kg / h, and the total amount of oxygen is 7,560 kg / h. The butene raw material is divided into two parts. Alkene: Oxygen: diluent molar ratio is 1:0.52:14. After mixing with oxygen and diluent, it enters the first-stage oxidative dehydrogenation reactor at a temperature of 320°C and a pressure of 0.12MPaG. The outlet gas temperature is 490°C. After heat exchange by the heat exchanger, it is mixed with the second-stage butene and the second-stage air to enter the secondary reactor. The flow rate of the second-stage butene is 10270 kg / h. The secondary reactor inlet butene: oxygen: The diluent molar ratio is 1:0.65:14, the reaction temper...

Embodiment 2

[0037] A 100,000 tons / year butene oxidative dehydrogenation to butadiene plant adopts figure 1 The process technology, the reactor is three-stage, and the three-stage reactors are all adiabatic radial fixed-bed reactors, using 72000 kg / h CO 2 As a diluent, the total amount of raw material butene is 18920kg / h, the total amount of air is 36000 kg / h, the butene raw material is divided into three parts, the flow rate of butene in the first stage is 9200 kg / h, according to the molar ratio of butene: oxygen: diluent is 1 : 0.5:10 ratio with air, CO 2 After mixing, it enters the first-stage oxidative dehydrogenation reactor at a temperature of 320°C and a pressure of 0.12MPaG. The outlet gas temperature of the first-stage reactor is 485°C. The first-stage air is mixed into the secondary reactor, the second-stage butene flow rate is 4800 kg / h, the secondary reactor inlet butene: oxygen: water molar ratio is 1:0.6:10, the reaction temperature is 330°C, and the pressure is 0.11MPaG. T...

Embodiment 3

[0041] A 100,000 tons / year butene oxidative dehydrogenation to butadiene plant adopts figure 1 The process technology, the reactor is two-stage, and the two-stage reactor is an adiabatic axial fixed-bed reactor, using 44000 kg / h CO 2 The mixed gas with 9000 kg / h water vapor is the diluent, the total amount of butene as raw material is 19670 kg / h, the total amount of air is 38500 kg / h, the butene raw material is divided into two parts, and the flow rate of butene in the first stage is 9400 kg / h The molar ratio of alkene:oxygen:diluent is 1:0.52:9. After mixing with air and diluent, it enters the first-stage oxidative dehydrogenation reactor at a temperature of 320°C and a pressure of 0.12MPaG. The outlet gas temperature is 500°C. After heat exchange by the heat exchanger, it is mixed with the second-stage butene and the second-stage air and enters the secondary reactor. The flow rate of the second-stage butene is 10270 kg / h. The inlet butene of the secondary reactor: oxygen: T...

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Abstract

The invention relates to an energy saving method for butadiene preparation by butylene oxydehydrogenation, and mainly solves the problems of large usage amount of water vapor and high energy consumption in the prior art. The method comprises the following steps: a) using an N grade (N is an integer no less than 2) multistage adiabatic fixed bed reactor in series and parallel connection for reaction; b) using at least one gas selected from N2, CO2, helium and water vapor, butylene raw material and oxygen-containing gas, dividing into N strands, mixing in proportion, respectively sending the mixture into each stage of the reactor, mixing reaction materials after reaction in each stage with supplementary materials of butylene and oxygen-containing gas, sending the mixture into a next stage of the reactor, wherein the reaction temperature of each reactor is 280-550 DEG C and pressure is 0.02-1.0 MPa. The technical scheme well solves the above problem and can be used in industrial production of butadiene preparation by butylene oxydehydrogenation.

Description

technical field [0001] The invention relates to an energy-saving method for preparing butadiene by oxidative dehydrogenation of butene. Background technique [0002] Butadiene is an important monomer of synthetic rubber and synthetic resin, mainly used in the synthesis of butadiene rubber, styrene-butadiene rubber, nitrile rubber and ABS resin. Butadiene is also a variety of coatings and organic chemical raw materials. [0003] At present, butadiene is mainly produced in two ways: separation of C4 fractions and synthesis (including butane dehydrogenation, butene dehydrogenation, butene oxidative dehydrogenation, etc.). At present, except the United States, almost all butadiene in the world comes directly from the by-product C4 fraction (also written as C4 fraction) when hydrocarbon cracking is used to produce ethylene. About half of the sources of butadiene in the United States come from the dehydrogenation of butane and butene, and half come directly from cracking C4 frac...

Claims

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Application Information

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IPC IPC(8): C07C11/16C07C5/48
Inventor 刘文杰
Owner CHINA PETROLEUM & CHEM CORP
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