Heterogeneous azeotropic distillation method for separating 2-pentanone, 4-heptanone, water and carbon dioxide mixture

A carbon dioxide and azeotropic distillation technology, which is applied in the field of distillation process system, can solve the problems of difficult to achieve high-purity separation of components, low degree of equipment integration, and limited to binary systems, so as to save equipment investment costs and Installation space, reduction of equipment investment cost and effect of low installation space and equipment investment cost

Active Publication Date: 2019-05-21
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although Luben WL (Luyben WL. Energy & Fuels, 2008, 22, 4249-4258) studied the control of heterogeneous azeotropic distillation to separate n-butanol-water system, this study is limited to binary systems, mainly for n-butanol Alcohol / water separation
Since 2-pentanone and 4-heptanone respectively form heterogeneous minimum boiling point azeotropes with water, it is difficult to achieve high-purity separation of components by ordinary distillation. Recently, Xia et al. (Xia M.Ind.&Eng.Chem.Res ., 2018, 57, 689-702) studied the corresponding process design and dynamic control for this mixture system, but the process proposed in this paper requires three rectification towers and a separator, the equipment investment cost is large, and the equipment integration degree is not high. high

Method used

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  • Heterogeneous azeotropic distillation method for separating 2-pentanone, 4-heptanone, water and carbon dioxide mixture
  • Heterogeneous azeotropic distillation method for separating 2-pentanone, 4-heptanone, water and carbon dioxide mixture
  • Heterogeneous azeotropic distillation method for separating 2-pentanone, 4-heptanone, water and carbon dioxide mixture

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A kind of partition tower, it comprises housing 11, lower sealing head 12, upper sealing head 13, there is rectangular dividing plate 14 between housing 11 along the axial direction of housing 11, and housing 11 is divided into partition wall left side 1 and On the right side of the next door 5, the bottom of the rectangular partition 14 goes directly to the lower head 12, and the top of the rectangular partition 14 goes directly to the upper head 13, or there is a part of space between the upper side and the upper head 13, and there is a ketone-rich phase inlet on the upper part of the left side of the next door 1 15. There is an inlet 16 for raw materials to be separated in the middle, an inlet 17 for a ketone-rich phase reboiler at the bottom, a mixed ketone outlet 18 at the bottom of the lower head 12 on the left side 1 of the next door, and an inlet 19 for a water-rich phase at the upper part on the right side 5 of the next door. There is a water-rich phase reboiler...

Embodiment 2

[0076] A kind of partition tower, it comprises housing 11, lower sealing head 12, upper sealing head 13, there is rectangular dividing plate 14 between housing 11 along the axial direction of housing 11, and housing 11 is divided into partition wall left side 1 and On the right side of the next door 5, the bottom of the rectangular partition 14 goes directly to the lower head 12, and the top of the rectangular partition 14 goes directly to the upper head 13, or there is a part of space between the upper side and the upper head 13, and there is a ketone-rich phase inlet on the upper part of the left side of the next door 1 15. There is a ketone-rich phase reboiler inlet 17 in the lower part, a mixed ketone outlet 18 at the bottom of the lower head 12 on the left side 1 of the next door, and a water-rich phase inlet 19 in the upper part on the right side 5 of the next door, and a water-rich phase reboiler in the lower part The device inlet 20 has a water phase outlet 21 at the bo...

Embodiment 3

[0107] A kind of partition tower, it comprises housing 11, lower sealing head 12, upper sealing head 13, there is rectangular dividing plate 14 between housing 11 along the axial direction of housing 11, and housing 11 is divided into partition wall left side 1 and On the right side of the next door 5, the bottom of the rectangular partition 14 goes directly to the lower head 12, and the top of the rectangular partition 14 goes directly to the upper head 13, or there is a part of space between the upper side and the upper head 13, and there is a ketone-rich phase inlet on the upper part of the left side of the next door 1 15. There is an inlet 16 for raw materials to be separated in the middle, an inlet 17 for a ketone-rich phase reboiler at the bottom, a mixed ketone outlet 18 at the bottom of the lower head 12 on the left side 1 of the next door, and an inlet 19 for a water-rich phase at the upper part on the right side 5 of the next door. There is a water-rich phase reboiler...

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Abstract

The invention provides a heterogeneous azeotropic distillation method for separating a 2-pentanone, 4-heptanone, water and carbon dioxide mixture. The method comprises the following steps: feeding a 2-pentanone, 4-heptanone, water and carbon dioxide raw material into a left half side of a partitioned water tower from an inlet of a raw material to be separated, carrying out gas-liquid separation, discharging a gas phase from a gas phase outlet, feeding into a condenser, and separating a condensed liquid by using a gas-liquid-liquid separator so as to obtain a carbon dioxide enriched gas phase,a ketone enriched phase and a water enriched phase, backflowing the ketone enriched phase into the left half side of the partitioned wall tower, backflowing the water enriched phase into a right halfside of the partitioned wall tower, extracting so as to obtain a carbon dioxide enriched gas, carrying out release, feeding the ketone enriched phase into the tower kettle of a distillation tower so as to obtain a 4-heptanone product, condensing a gas phase discharged from the top of the distillation tower by using a distillation tower condenser, backflowing a part of the gas phase into the distillation tower, and collecting the other part as a 2-pentanone product. The method has the advantages of being good in separation effect, and the investment expense and the mounting space can be greatlyreduced and saved.

Description

technical field [0001] The invention relates to a rectification process system for the separation of mixed ketone water systems, in particular to the field of separation of downstream products of 2-pentanone / 4-heptanone produced by cracking mixed acids. Background technique [0002] The mixture of 2-pentanone / 4-heptanone / water can be obtained by the reaction of acetic acid and n-butyric acid. If the mixture is not further processed, it is difficult to meet the purity requirements of market commodities. Therefore, it is urgent to solve the separation and purification problem of the mixture of 2-pentanone / 4-heptanone / water / carbon dioxide. [0003] Although Luben WL (Luyben WL. Energy & Fuels, 2008, 22, 4249-4258) studied the control of heterogeneous azeotropic distillation to separate n-butanol-water system, this study is limited to binary systems, mainly for n-butanol Alcohol / water separation. Since 2-pentanone and 4-heptanone respectively form heterogeneous minimum boiling...

Claims

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Application Information

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IPC IPC(8): B01D3/14C07C49/607C07C45/78
Inventor 李德宝夏铭贾丽涛侯博肖勇鲁怀乾
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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