A kind of method of producing cyclopentene by dicyclopentadiene

Abstract

The invention discloses a method for producing cyclopentene from dicyclopentadiene. A catalytic distillation column is adopted and comprises a rectifying section, a reaction rectifying section and a stripping section inside; a dicyclopentadiene material is heated, partially decomposed and directly fed into the distillation column with hydrogen; a dicyclopentadiene decomposition product and hydrogen flow upwards to enter the reaction rectifying section and are subjected to contact, mass transfer, heat transfer and a hydrogenation reaction with a hydrogenation catalyst packed in the reaction rectifying section with a reflux distillate oil light component; a product obtained after the reaction is discharged from the top of the column after passing by the rectifying section; distillate oil light components which are not involved in the reaction are extracted from the lateral line of the rectifying section and return to the distillation column after being cooled; undecomposed dicyclopentadiene materials downwards flow into the stripping section to make contact and exchange heat with rising distillate oil gas-phase components in the column bottom. The higher selectivity and yield of thetarget product, namely, cyclopentene can be realized with the method.

Description

technical field

[0001] The invention relates to a method for preparing cyclopentene, in particular to a method for preparing cyclopentene from dicyclopentadiene through cracking and selective hydrogenation. Background technique

[0002] Cyclopentene is an important organic chemical raw material, widely used in organic synthesis, fine chemical industry, synthetic rubber and pharmaceutical industry and other fields. Because there are active double bonds in the molecule of cyclopentene, it can be used to prepare many high value-added fine chemical products such as glutaraldehyde and cyclopentanol.

[0003] Theoretically speaking, there are many preparation methods of cyclopentene, but in actual production, cyclopentene mostly uses dicyclopentadiene as the technical route of raw material, and when this technical route is used for production, the following two-step reaction method is required It can be obtained: dicyclopentadiene is heated and depolymerized into cyclopentadiene;...

Examples

Embodiment 1-3

[0081] The specifications of the catalytic distillation tower are: the tower column is 32mm in Ф, the column length is 1000mm, the volume of the tower kettle is 1000mL, and the whole tower body is made of stainless steel. A separation filler and a hydrogenation catalyst are loaded in the column of the catalytic rectification tower. Specifically: (1) Take 200mL of Φ3mm stainless steel wire mesh Φ ring separation packing and install it in the upper half of the column of the catalytic distillation tower; (2) Take 200mL of Pd / Al 2 o 3 Catalyst, installed in the middle section of the column of the catalytic rectification tower; (3) Take 200mL of Φ3mm stainless steel wire mesh Φ ring separation packing, and install it in the lower section of the column of the catalytic rectification tower. The raw material hydrogen is directly sent to the bottom of the catalyst bed without preheating; the raw material dicyclopentadiene is sent to the raw material heater for heating, and then enters...

technical field

[0001] The invention relates to a method for preparing cyclopentene, in particular to a method for preparing cyclopentene from dicyclopentadiene through cracking and selective hydrogenation. Background technique

[0002] Cyclopentene is an important organic chemical raw material, widely used in organic synthesis, fine chemical industry, synthetic rubber and pharmaceutical industry and other fields. Because there are active double bonds in the molecule of cyclopentene, it can be used to prepare many high value-added fine chemical products such as glutaraldehyde and cyclopentanol.

[0003] Theoretically speaking, there are many preparation methods of cyclopentene, but in actual production, cyclopentene mostly uses dicyclopentadiene as the technical route of raw material, and when this technical route is used for production, the following two-step reaction method is required It can be obtained: dicyclopentadiene is heated and depolymerized into cyclopentadiene;...

Examples

Embodiment 1-3

[0081] The specifications of the catalytic distillation tower are: the tower column is 32mm in Ф, the column length is 1000mm, the volume of the tower kettle is 1000mL, and the whole tower body is made of stainless steel. A separation filler and a hydrogenation catalyst are loaded in the column of the catalytic rectification tower. Specifically: (1) Take 200mL of Φ3mm stainless steel wire mesh Φ ring separation packing and install it in the upper half of the column of the catalytic distillation tower; (2) Take 200mL of Pd / Al 2 o 3 Catalyst, installed in the middle section of the column of the catalytic rectification tower; (3) Take 200mL of Φ3mm stainless steel wire mesh Φ ring separation packing, and install it in the lower section of the column of the catalytic rectification tower. The raw material hydrogen is directly sent to the bottom of the catalyst bed without preheating; the raw material dicyclopentadiene is sent to the raw material heater for heating, and then enters...

Images