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Design method of rectification process for synthesizing cyclohexanone-cyclohexanol by cyclohexene technology

A process design and cyclohexanol technology, applied in the field of cyclohexanone-cyclohexanol rectification process, can solve problems such as low energy utilization rate, and achieve the effects of improving energy utilization rate, reducing energy consumption, and improving energy-saving effect

Active Publication Date: 2020-01-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating cost of the existing four-column distillation process is close to 60% TAC, and the energy utilization rate of the process is low

Method used

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  • Design method of rectification process for synthesizing cyclohexanone-cyclohexanol by cyclohexene technology
  • Design method of rectification process for synthesizing cyclohexanone-cyclohexanol by cyclohexene technology
  • Design method of rectification process for synthesizing cyclohexanone-cyclohexanol by cyclohexene technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: 5 tower cyclohexanone-cyclohexanol double-effect rectification, such as figure 2 shown. The product of the dehydrogenation reaction of cyclohexanol enters the light first tower to extract light components from the top of the tower, and the output from the bottom of the tower is used as the feed of the light second tower, and the top discharge of the light second tower contains a certain amount of light components as feed Circulate back to the light first tower, the bottom of the light second tower is a mixture of cyclohexanone, cyclohexanol and heavy components entering the ketone tower, cyclohexanone is withdrawn from the top of the tower, and the bottom of the ketone tower is a mixture of cyclohexanol and heavy components entering the alcohol In the first tower, part of the cyclohexanol is extracted from the top of the alcohol first tower and recycled to the dehydrogenation reactor, and the output from the bottom of the tower enters the second alcohol t...

Embodiment 2

[0019] Embodiment 2: 5 towers cyclohexanone-cyclohexanol heat pump rectification, as image 3 shown. Introduce heat pump rectification in alcohol one tower to replace the double-effect rectification in embodiment 1, alcohol one tower overhead steam is compressed to 50kPa by compressor and then supplies heat to self reboiler, all the other information is the same as in embodiment 1. Compared with the original 4-tower process, the operating cost and annual total cost of the 5-tower heat pump process are reduced by 45.4% and 23.6% respectively.

Embodiment 3

[0020] Embodiment 3: 5 tower cyclohexanone-cyclohexanol double-effect heat pump rectification, such as Figure 4 shown. On the basis of embodiment 1, the reflux rate of the light one tower is reduced to make the light one tower heat load the lowest, and a heat pump is introduced in the light two tower to compress the vapor at the top of the tower to 120kPa to supply heat to its own reboiler, and the rest of the information is consistent with the implementation Same as in Example 1. Compared with the original 4-tower process, the operating cost and annual total cost of the 5-tower double-effect heat pump process are reduced by 56.3% and 29.2% respectively.

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Abstract

The invention provides a design method of a rectification process for synthesizing cyclohexanone-cyclohexanol by a cyclohexene technology. The method is concretely characterized in that existing four-tower alcohol ketone rectification is optimized, and double-effect heat pump heat integrated rectification is introduced; the tower bottom material of a first light tower is used as a feeding materialfor a second light tower, the tower top material of the first light tower is extracted, a material discharged from the top of the second light tower is circulated back to the feeding position of thefirst light tower, the tower bottom material of the second light tower is used as a feeding material for a ketone tower, the operation parameters of the light tower system are optimized optimal values, two alcohol towers are adopted to replace an existing cyclohexanol single-tower separation process, and a gas phase at the top of a first alcohol tower is used as a heat source for the bottom of theketone tower. Compared with an existing four-tower process, the method can remarkably reduce the energy consumption and TAC in the cyclohexanone-cyclohexanol rectification process under the conditionthat the same separation requirement is met.

Description

technical field [0001] The invention relates to a cyclohexanone-cyclohexanol rectification method, in particular to a cyclohexanone-cyclohexanol rectification process in the cyclohexene hydration process to generate cyclohexanone. Background technique [0002] As the key raw material for the synthesis of nylon-6 and nylon-66 intermediates caprolactam and adipic acid, cyclohexanone has a very wide market demand. The hydration method of cyclohexene to synthesize cyclohexanol and dehydrogenation to cyclohexanone is considered to be the most environmentally friendly synthesis method of cyclohexanone because of its high resource utilization rate, mild reaction conditions, and low pollution. Affected by the conversion rate of cyclohexanol dehydrogenation reaction, there will be a large amount of unreacted cyclohexanol in the dehydrogenation product that needs to be recycled; in addition, cyclohexanone-cyclohexanol belongs to a near-boiling point system, and vacuum is required to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C35/08C07C45/82C07C49/303
CPCC07C29/80C07C45/82C07C2601/14C07C35/08C07C49/303
Inventor 孙津生王虹丹
Owner TIANJIN UNIV
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