Tubular furnace method pressure-reduced debenzolization and distillation process

A tube furnace and benzene removal technology, which is applied in vacuum distillation, distillation purification/separation, petroleum industry, etc., can solve the problems of short process and low energy consumption, achieve small footprint, reduce waste water discharge, and reduce energy consumption Effect

Inactive Publication Date: 2011-09-28
上海同特化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies of existing oil-rich debenzene distillation processes at home and abroad, combined with the current situation of the crude benzene market, the technical problem to be solve

Method used

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  • Tubular furnace method pressure-reduced debenzolization and distillation process
  • Tubular furnace method pressure-reduced debenzolization and distillation process
  • Tubular furnace method pressure-reduced debenzolization and distillation process

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Example 1 In the tube furnace method decompression debenzene distillation process, the rich oil (the main property indicators are shown in Table 1) sent out from the benzene washing section enters the tubular furnace after heat exchange by the oil-gas heat exchanger and the lean-rich oil heat exchanger. The convection section of the heating furnace is preheated to 175°C and enters the debenzene tower with 2 trays in the rectification section for debenzene distillation. The top pressure of the debenzene tower is 13.3kPa, and the bottom pressure is 23.3kPa; , the temperature at the bottom of the tower is 195°C. The yield of crude benzene produced at the top of the tower is 1.35% (to dry coal). The lean oil at the bottom of the tower returns to the benzene washing tower. Compared with the tube furnace method and the steam method, the oil-rich debenzene can save energy by 20%.

[0014] The main property indexes of crude benzene product are shown in Table 2, and the main p...

Embodiment 2

[0016] In the tube furnace vacuum debenzene distillation process, the rich oil (main property indicators shown in Table 1) sent out from the benzene washing section passes through the oil-gas heat exchanger and the lean-rich oil heat exchanger, and then enters the tubular heating furnace for convection. Section is preheated to 185 ℃ and enters the debenzene tower with 10 layers of trays in the rectification section for debenzene distillation. The pressure at the top of the debenzene tower is 70kPa, and the pressure at the bottom of the tower is 80kPa; 270°C. The crude benzene product is extracted from the top of the tower, and the yield is 1.1% (to dry coal), and the lean oil at the bottom of the tower returns to the benzene washing tower. Compared with the steam method of the tube furnace method, the oil-rich debenzene can save energy by 14.5%.

[0017] The main property indexes of crude benzene product are shown in Table 2, and the main property indexes of lean oil are show...

Embodiment 3

[0019] The original traditional single-tower benzene removal, crude benzene production process, 60 tons / hour oil washing cycle, crude benzene output 0.82 tons / hour, steam consumption 1.2 tons / hour. The debenzene removal tower equipment was replaced through technical improvement, the regenerator was canceled, and the above-mentioned tubular furnace method vacuum removal benzene distillation process was adopted. The rich oil (main property indicators shown in Table 1) sent out from the benzene washing section passed through the oil-gas heat exchanger and the lean oil After heat exchange, the oil-rich heat exchanger enters the convection section of the tubular heating furnace to preheat to 180°C and enters the debenzene tower with 6 trays in the rectification section for debenzene distillation. The top pressure of the debenzene tower is 41.6kPa, and the bottom of the tower The pressure is 51.7kPa; the temperature at the top of the tower is 62.5°C, and the temperature at the bottom...

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Abstract

The invention discloses a tubular furnace method pressure-reduced debenzolization and distillation process. The process comprises the following steps of: carrying out heat exchange on rich oil from a benzene washing section by using an oil-gas heat exchanger and a lean oil-rich oil heat exchanger, entering the convection section of a tubular heating furnace for heating to 175-185 DEG C, then entering a debenzolization tower for debenzolization and distillation, collecting a crude benzene product from the tower top and returning lean oil at the tower bottom to a benzene washing tower, wherein the tower top pressure of the debenzolization tower is 13.3-70 kPa and the tower bottom pressure is 23.3-80 kPa; and the tower top temperature is 40-80 DEG C and the tower bottom temperature is 195-270 DEG C. Compared with traditional debenzolization processes, the pressure-reduced debenzolization and distillation process mainly has the advantages that: 1. the operation can be carried out under a negative pressure, and steam stripping can be omitted; 2. the yield of crude benzene is improved by 0.05-0.35%; 3. steam is not used; 4. since a regenerator is not used, the process structure is more compact and the occupation area is smaller; and 5. One oil-water separator is omitted, the regenerator is not used and a novel debenzolization tower is designed, thus effectively saving equipment investment cost.

Description

technical field [0001] The invention relates to a new process for recovering crude benzene, which belongs to coking engineering technology, in particular to an integrated tube furnace vacuum debenzene distillation process. Background technique [0002] At present, most crude benzene distillation processes in China mainly adopt the method of steam stripping at atmospheric pressure, and use single-tower or double-column processes to obtain one kind of benzene, two kinds of benzene or three benzene products under normal pressure. This type of benzene removal process uses low-pressure steam as a heat source. The function of the steam is (1) to strip the crude benzene in the debenzene tower and (2) to provide a heat source for the regenerator, so that the regenerator can discharge slag smoothly. This process is mature and stable, but a large amount of organic wastewater will be generated during the distillation process, which will pollute the environment and also increase the pre...

Claims

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Application Information

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IPC IPC(8): C07C15/04C10K1/18C10G7/06C07C7/04
Inventor 余兆祥黄恒波杨勇李现坡
Owner 上海同特化工科技有限公司
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