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Pretreatment device and treatment process for fixed bed catalytic hydrogenation

A pretreatment device and catalytic hydrogenation technology, applied in organic chemistry, hydrogenation hydrocarbon production, etc., can solve problems such as uneven distribution of catalyst beds, uneven gas-liquid mixing, etc., to reduce production costs, increase conversion rate, and increase production capacity Effect

Pending Publication Date: 2019-09-06
YICHANG SUPENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above problems, the present invention pretreats the raw material hydrogen and benzene-ring organic matter through a hydrogen preheater and a falling film evaporator, so that the raw material can form a mixed gas before entering the reactor, and fully contact the catalyst bed, avoiding gas The problem of uneven liquid mixing and uneven distribution in the catalyst bed can greatly improve the hydrogenation conversion rate

Method used

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  • Pretreatment device and treatment process for fixed bed catalytic hydrogenation
  • Pretreatment device and treatment process for fixed bed catalytic hydrogenation

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A pretreatment device for catalytic hydrogenation, the hydrogen pipeline 8 is connected with the top of the hydrogen preheater 1, the steam pipeline 9 is connected with the upper part of the hydrogen preheater 1; the bottom of the hydrogen preheater 1 is connected with the falling film steamer 2, and the falling film The steamer 2 is connected to the hydrogenation reactor 3, and the hydrogenation reactor 3 is connected to the recovery system.

[0029] The organic material pipeline 7 is connected to the upper part of the falling film steamer 2; the heat transfer oil system 4 is connected to the lower part of the shell side of the falling film steamer 2 through the pipeline, and the upper part of the shell layer of the falling film steamer 2 is connected to the hydrogenation reactor 3 through the pipeline. .

[0030] The falling film steamer 2 is provided with a plurality of tubes 5, and the tubes 5 extend above the baffle 6 and exceed the organic material inlet.

[0031...

Embodiment 2

[0033] The raw hydrogen is transported into the hydrogen preheater through pipelines, and the hydrogen flow is controlled to 280m 3 / h, 0.8MPa saturated steam is introduced into the hydrogen preheater to ensure that the hydrogen temperature in the preheater is controlled at 120°C, the raw material o-cresol is pumped from the metering tank to the falling film evaporator, and the o-cresol feed is controlled At this time, the set temperature of the shell-side heat transfer oil of the falling film evaporator is 180 °C, and the hydrogen and o-cresol are fully mixed into the fixed-bed hydrogenation reactor. The operating pressure inside the reactor is 0.4 MPa, obtaining O-methylcyclohexanol, the hydrogenation conversion rate is 90.7%.

Embodiment 3

[0035] The specific process operation is shown in Example 2, and the feed hydrogen is 250 m 3 / h, the o-cresol feed is 150L / h, the operating temperature in the hydrogenation reactor is 155°C, the operating pressure is 0.4MPa, the set temperature of the heat transfer oil is 160°C, and the vapor pressure of the hydrogen preheater is 0.78MPa. After the raw material was pretreated, the hydroconversion rate was 81.6%.

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Abstract

The invention provides a pretreatment device and a treatment process for fixed bed catalytic hydrogenation. A hydrogen pipeline is connected to the top of a hydrogen preheater. A steam pipeline is connected to the upper part of the hydrogen preheater. The bottom of the hydrogen preheater is connected to a falling film steamer. The falling film steamer is connected to a hydrogenation reactor. The hydrogenation reactor is connected to a recovery system. An organic material pipeline is connected to the upper part of the falling film steamer. A heat conducting system is connected to the lower partof a shell side of the falling film steamer through a pipeline. The upper part of a shell layer of the falling film steamer is connected to the hydrogenation reactor through a pipeline. Multiple rowtubes are arranged in the falling film steamer. The row tubes extend above a baffle plate and exceed an organic material inlet. The device can greatly increases the conversion rate of the hydrogenation reaction, greatly increases the production capacity and reduces the cost. Meanwhile, the use cycle of a catalyst is greatly improved so as to further reduce the cost.

Description

technical field [0001] The invention relates to a pretreatment device and process for fixed-bed catalytic hydrogenation, in particular to a gas-liquid two-phase feed of benzene ring organics and hydrogen, and the pretreatment of hydrogenation reaction is carried out in a fixed-bed catalytic hydrogenation reactor device and process. Background technique [0002] At present, various types of hydrogenation units are increasing in my country, and hydrogenation technology has been rapidly improved. The level of hydrogenation process technology mainly depends on the advanced nature of catalyst performance, and the full play of catalyst performance depends to a large extent. The advancement and rationality of the internal structure of the reactor. [0003] At present, my country's hydrogenation reactors are mainly fixed-bed hydrogenation reactors. The internal components of a typical fixed-bed hydrogenation reactor mainly include the following parts: inlet diffuser, distribution pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C13/18C07C5/10
CPCC07C5/10C07C13/18
Inventor 戴宁吴杰王勇叶敏
Owner YICHANG SUPENG TECH CO LTD