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Endothermic reaction method

An endothermic reaction and reactor technology, applied in the field of chemical reaction, can solve the problems that it is difficult to ensure the heat transfer of reaction tubes, uneven temperature distribution in the axial and radial directions, and affect the reaction temperature, so as to save equipment investment, compact structure, Good heat exchange effect

Active Publication Date: 2009-07-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0009] The technical problem mainly solved by the present invention is that the heat carrier (molten salt) system configuration of the tube-and-tube fixed-bed reactor used for endothermic reaction in the prior art is cumbersome and expensive, and the axis in the shell side of the reactor is radial Due to uneven temperature distribution, it is difficult to ensure sufficient and uniform heat transfer between the reaction tubes, which affects the control of the reaction temperature; part of the reaction tubes in the reactor is severely impacted by the high-temperature molten salt, causing large vibrations in the reaction tubes. Provide a A new method for endothermic reactions

Method used

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Embodiment 1

[0021] 6000 tons / year ethanol dehydration to ethylene plant, using ethanol as raw material, using figure 1 The shown tubular fixed-bed reactor adopts alumina catalyst. The shell side temperature is 450°C, the tube side temperature is 430°C, the reaction pressure is normal pressure, and the raw material space velocity is 1.0 hour -1. The diameter of the reactor cylinder is 1600 mm. The molten salt feeding port is located in the axial direction of the upper shell of the reactor. The outer diameter of the heating tube is 89 mm. Distribution, the outer diameter of the reaction tube is 57 mm, the outer diameter of the large end of the conical spring is 52 mm, and the number of shoulders in the tube wall at the lower end of the reaction tube is 4, and they are evenly distributed along the circumferential direction of the tube wall. 4 radial thermometers are evenly arranged along the circumferential direction at the inner diameter of the reactor of 900 mm, and 2 thermometers are re...

Embodiment 2

[0025] 3000 tons / year ethanol dehydration to ethylene plant, using ethanol as raw material, using figure 1 The shown tubular fixed-bed reactor adopts alumina catalyst. The shell side temperature is 430°C, the tube side is 410°C, the reaction is carried out under normal pressure, and the raw material space velocity is 0.8 hours -1 . The diameter of the reactor cylinder is 1000 mm. The molten salt feed port is located in the axial direction of the upper shell of the reactor. The outer diameter of the heating tube is 76 mm. The concentric circles are evenly distributed, the outer diameter of the reaction tube is 45 mm, the outer diameter of the large end of the conical spring is 40 mm, and the number of shoulders in the tube wall at the lower end of the reaction tube is 2, and they are evenly distributed along the circumferential direction of the tube wall. 4 radial thermometers are evenly arranged along the circumferential direction at the inner diameter of the reactor of 600 ...

Embodiment 3

[0027] 6000 tons / year urea low-pressure catalytic melamine plant, using urea as raw material, using figure 1 The tubular fixed-bed reactor shown uses silica-alumina gel catalyst. The shell side temperature is 375°C, the tube side is 355°C, the reaction pressure is normal pressure, and the raw material space velocity is 0.6 hours -1 . The diameter of the reactor cylinder is 1800 mm. The molten salt feed port is located in the axial direction of the upper shell of the reactor. The heating pipe is inserted into the shell from the axial direction of the upper part of the reactor, and is evenly distributed in concentric circles in the cylinder. Set up 4 radial thermometers at 300 mm, 600 mm, 900 mm, and 1000 mm in the inner diameter of the reactor, respectively, at 1 / 4, 1 / 2, and 3 / 4 heights of the reactor axial distance from the lower end of the reactor Set up 3 thermometers separately. The four radial temperatures measured were 375.5°C, 376.6°C, 376.1°C and 375.2°C; the three a...

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Abstract

The invention relates to a method for heat absorbing reaction, and mainly solves the problems of large axial-radial temperature difference of a tubular fixed bed reactor using molten salt as a heat carrier, larger vibration of a reaction tube, and inconvenience to detach a catalyst in the prior art. The invention adopts the technical proposal that a heating tube is arranged in a reactor shell and a convex shoulder and conical spring structure is designed in the reaction tube, the method solves the problems well, and can be used for industrial production of the heat absorbing reaction.

Description

technical field [0001] The present invention relates to a method for chemical reaction, in particular to a method for endothermic reaction. Background technique [0002] The tubular fixed bed reactor is widely used in the gas-solid phase catalytic reaction process in the chemical industry and petrochemical industry, and is one of the commonly used chemical equipment. Generally, chemical reactions occur in reaction tubes filled with catalysts, and the reaction process is often accompanied by heat absorption or exotherm, that is, there is often heat exchange between the tube side and the shell side of the reactor, so the heat of reaction must be passed through the reactant or the reactor in a timely and effective manner. The heat carrier is supplied or removed to ensure the temperature balance between the reaction tubes and to avoid the catalyst's temperature runaway and coking. Therefore, the heat exchange effect of the reactor will directly affect the reaction performance, ...

Claims

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Application Information

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IPC IPC(8): B01J8/06
Inventor 黄云群沈伟胡力智吴一鸣刘军
Owner CHINA PETROLEUM & CHEM CORP
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