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Two-reaction system for preparing butadiene through oxidative dehydrogenation of butene and anti-carbon method

An oxidative dehydrogenation and butadiene technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve problems such as reactors not working properly, channel blockages, etc. The effect of prolonging the production cycle

Inactive Publication Date: 2015-01-07
张守义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Over time, the liquid butadiene dimer becomes more and more viscous, and the channel of the reaction gas is severely blocked; or it is "baked" by the high-temperature gas and solidified, forming the so-called "carbon deposit", which makes the reactor abnormal. work, forced to stop and clean up

Method used

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  • Two-reaction system for preparing butadiene through oxidative dehydrogenation of butene and anti-carbon method
  • Two-reaction system for preparing butadiene through oxidative dehydrogenation of butene and anti-carbon method
  • Two-reaction system for preparing butadiene through oxidative dehydrogenation of butene and anti-carbon method

Examples

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Effect test

Embodiment 1

[0090] Such as figure 2 Shown, a kind of butene oxidative dehydrogenation produces the double reaction system of butadiene, comprises:

[0091] Stage I reactor 1, Stage II reactor 2, Stage I mixer 4, Stage II mixer 5 and front heat exchanger 3, Stage I reactor 1 and Stage II reactor 2 are connected in series, and Stage I mixer 4 is set On the inlet pipeline of the first-stage reactor 1, the second-stage mixer 5 is arranged between the first-stage reactor 1 and the second-stage reactor 2, and the front heat exchanger 3 is arranged at the outlet of the second-stage reactor 2,

[0092] The first-stage heat exchanger 15 is installed at the outlet of the first-stage reactor 1, and the raw material steam pipeline passes through the first-stage heat exchanger 15, the front heat exchanger 3 and the first-stage mixer 4 in turn, and then connects to the first-stage reactor 1 inlet; A mixer 6 is arranged on the steam line between the heat exchanger 15 and the front heat exchanger 3 ; a...

Embodiment 2

[0100] Such as image 3 Shown, a kind of butene oxidative dehydrogenation produces the double reaction system of butadiene, comprises:

[0101] On the basis of Example 1, the water injection point of one stream (stream 13) is added on the mixer, and the temperature is lowered together with the butene (liquid) feed steam of the first stage.

[0102] This embodiment and figure 1 Compared with the current Qilu process, the water spray point and / or butene (liquid) spray point in the Qilu process has been removed, and the cause of "carbon deposition" at the inlet of the second stage reactor has been eliminated.

Embodiment 3

[0104] Such as Figure 4 Shown, a kind of butene oxidative dehydrogenation produces the double reaction system of butadiene, comprises:

[0105] Same as Example 2, the difference is only to add the I-stage butene (stream 10) at the I-stage mixer.

[0106] This embodiment and figure 1 Compared with the current Qilu process, the water spray point and / or butene (liquid) spray point in the Qilu process has been removed, and the cause of "carbon deposition" at the inlet of the second stage reactor has been eliminated.

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Abstract

The invention discloses a two-reaction system for preparing butadiene through oxidative dehydrogenation of butene and an anti-carbon method. The system comprises an I-section reactor, an II-section reactor, an I-section mixer, an II-section mixer and a front heat exchanger, wherein an I-section heat exchanger is arranged at an outlet of the I-section reactor; a raw material steam pipe is connected with an inlet of the I-section reactor after passing through the I-section heat exchanger and the front heat exchanger in sequence; and a water spraying point is arranged on the steam pipe between the front heat exchanger and the I-section mixer. The method comprises the following steps: (1) raw material steam conducts heat exchange with I-section reaction generation gas at first, and conducts heat exchange with II-section reaction generation gas after entering the mixers and being cooled; (2) the raw material steam subjected to heat exchange is cooled through the water spraying point, and enters the I-section reactor after being mixed with I-section butene and I-section air; and (3) the I-section reaction generation gas enters the II-section reactor after being subjected to heat exchange with the raw material steam and mixed with II-section butene and the II-section air. The system and the method can reduce carbon deposition of high boiling point component condensate, and prolong the service life of equipment.

Description

technical field [0001] The invention relates to the field of chemical industry, and more particularly relates to a double reaction system for preparing butadiene by oxidative dehydrogenation of butene and a method for preventing carbon deposition. Background technique [0002] The reaction raw materials for butene oxidative dehydrogenation to butadiene include raw butene, air and raw material steam, and the product after the reaction is called reaction gas, or generated gas. The reaction mainly occurs between butene and oxygen to generate butadiene, carbon monoxide, carbon dioxide and water (called water generation). The reaction equation is as follows: [0003] [0004] In addition to the main reaction and the main side reaction, there are also secondary side reactions, which are not listed here. The products are dozens of organic oxygen-containing compounds (aldehydes, ketones, acids), dimers, etc., and the quantity is ppm Class. [0005] In the reaction equation, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/167C07C5/48
Inventor 张守义
Owner 张守义
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