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Solvent recovery system and method for isopropanol urea dewaxing process

A urea dewaxing and recovery system technology, applied in chemical instruments and methods, preparation of organic compounds, separation/purification of hydroxyl compounds, etc., can solve problems such as personal injury and environmental pollution, achieve high recovery rate and reduce energy consumption , the effect of improving economic efficiency

Pending Publication Date: 2020-09-25
中国石油集团东北炼化工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a solvent recovery system and a recovery method of the isopropanol urea dewaxing process to solve the problems of environmental pollution and personal injury caused by the azeotropic agent benzene in the alcohol recovery unit of the existing process

Method used

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  • Solvent recovery system and method for isopropanol urea dewaxing process
  • Solvent recovery system and method for isopropanol urea dewaxing process

Examples

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Embodiment 1

[0033] A solvent recovery system for the isopropanol urea dewaxing process, including an alcohol concentration tower, an extractive distillation tower and a solvent recovery tower connected in sequence; the alcohol concentration tower includes a tower body I1, and a cooler is connected to the top of the tower body I1 in sequence Ⅰ4, reflux tank Ⅰ5, reflux pump 6, the bottom of tower body Ⅰ1 is connected with reboiler Ⅰ2 and tower bottom pump Ⅰ3 in turn; the extractive distillation tower includes tower body Ⅱ7, and the top of tower body Ⅱ7 is connected with cooler Ⅱ10 and reflux tank Ⅱ11 in sequence , reflux pump 17, reboiler Ⅱ8 and tower bottom pump Ⅱ9 are successively connected to the bottom of tower body Ⅱ7; solvent recovery tower includes tower body Ⅲ12, and the top of tower body Ⅲ12 is connected to cooler Ⅲ15, reflux tank Ⅲ16, reflux pump 18, tower The bottom of body III12 is successively connected with reboiler III13 and tower bottom pump III14; the alcohol concentration t...

Embodiment 2

[0035] For the process flow of the alcohol recovery unit of a 100,000 tons / year isopropanol urea dewaxing unit, see figure 1 , the alcohol concentration tower has 48 layers of trays, the extractive distillation tower has 42 layers of trays, and the solvent recovery tower has 50 layers of trays, and the concentration is the mixture of 12.7%wt isopropanol and water (flow 25t / h, temperature 40 ℃) into the alcohol concentration tower 1, obtain about 86.1%wt isopropanol aqueous solution (flow 3.737t / h, temperature 40 ℃) at the tower top, obtain the water of purity 99.99%wt (flow 21.627t / h) at the bottom of the tower Sent to the washing unit for recycling. The top product of the alcohol concentration tower is sent to the extractive distillation tower 7, enters in the 20th tray of the extractive distillation tower, further concentrates, and injects the extractant ethylene glycol at the 6th tray of the extractive distillation tower 7 Alcohol, the isopropanol (flow rate 3.288t / h) of 9...

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Abstract

The invention belongs to the field of isopropanol urea dewaxing processes, and particularly relates to a solvent recovery system and method for an isopropanol urea dewaxing process. The system comprises an alcohol concentration tower, an extractive distillation tower and a solvent recovery tower which are connected in sequence. A mixture of isopropanol and water enters the alcohol concentration tower, about 86 wt% of an aqueous isopropanol solution is obtained at the top of the alcohol concentration tower and sent to the extractive distillation tower for further concentration, and water obtained at the bottom of the alcohol concentration tower is sent to a water washing unit for recycling; an ethylene glycol extractant is injected into the upper part of the extractive distillation tower, isopropanol distilled from the top of the extractive distillation tower is sent to a urine preparation unit for recycling, and an aqueous ethylene glycol solution at the bottom of the extractive distillation tower is sent to the solvent recovery tower for separation of water and ethylene glycol; and water distilled from the top of the solvent recovery tower is conveyed to the washing unit for recycling, and ethylene glycol distilled from the bottom of the solvent recovery tower is conveyed to the extractive distillation tower for recycling. According to the system and the method in the invention, the problems of environmental pollution and personal injury caused by the entrainer benzene of alcohol recovery units of conventional isopropanol urea dewaxing devices are solved, and an isopropanol recovery rate is high and reaches 99.92%.

Description

technical field [0001] The invention belongs to the field of isopropanol urea dewaxing technology, and in particular relates to a solvent recovery system and a recovery method of the isopropanol urea dewaxing process. Background technique [0002] The alcohol recovery unit of the traditional isopropanol urea dewaxing process uses benzene as an entrainer to obtain high-purity isopropanol. This process consumes a lot of energy, and there are human hazards and environmental pollution problems in the production process of benzene. Therefore, the research and development of new technology has important application value. [0003] In the patent CN105733677A, a solvent recovery method for the isopropanol urea dewaxing process is proposed. After the dewaxing liquid and the wax liquid are heated, they enter the stripping tower and react with the isopentane entering the lower part of the stripping tower. A mixed solution of isopropanol and water is obtained, the bottom product enters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/10C07C29/84C07C29/74
CPCC07C29/84C07C29/74C07C31/10
Inventor 李昕益陶德宏张成武于杨卓强周雪雷张颂孙琪赵艺聪罗丽华周玉鑫吕广梅谢磊马琳王岩
Owner 中国石油集团东北炼化工程有限公司
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