Unlock instant, AI-driven research and patent intelligence for your innovation.

Heat-exchange method for ketone-benzol dewaxing device solvent recovery system

A ketone benzene dewaxing and recovery system technology, which is applied in the fields of petroleum wax recovery, petroleum industry, refined hydrocarbon oil, etc., can solve the problems of low heat exchange solvent evaporation rate and the like

Active Publication Date: 2010-03-10
SINOPEC SHANGHAI ENG
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is that the existing ketone-benzene dewaxing device cannot make full use of the heat of the heat flow, and the evaporation rate of the heat exchange solvent is low. hot method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Heat-exchange method for ketone-benzol dewaxing device solvent recovery system
  • Heat-exchange method for ketone-benzol dewaxing device solvent recovery system
  • Heat-exchange method for ketone-benzol dewaxing device solvent recovery system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] according to figure 2 The process flow, the heating medium is medium pressure steam, the pressure is 1.1MPa. The mixture stream A containing solvent methyl ethyl ketone and toluene enters the primary evaporation tower T 1 In the middle part, after evaporation, the top stream Ia and the stream A pass through the heat exchanger 14 and the heat exchanger 12 twice and then exit the system, and the tower bottom stream Ib enters the secondary evaporation tower T 2 Middle part; wherein the weight ratio of toluene and methyl ethyl ketone in the mixture stream A is 1:2.

[0026] Stream Ib passes through the secondary evaporation tower T 2 After evaporation, the tower top stream IIa first exchanges heat with stream Ib once through heat exchanger 18, then exchanges heat with stream A twice through heat exchanger 15 and heat exchanger 13, and then exits the system, and the tower still stream IIb enters the third evaporation Tower T 3 middle part.

[0027] Stream IIb passes th...

Embodiment 2

[0035] Press the flow process of [embodiment 1], just the operating conditions of each evaporation tower are different. The specific operating conditions and reaction results of each evaporation tower are shown in Table 2.

[0036] Table 2

[0037]

[0038] * The amount of water contained in the solvent is included in the amount of solvent at the bottom of the tower, and most of the bottom of T5 is water, and this part of water comes from the stripping steam. At the end of T4, there is no moisture brought by system feed A.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a heat exchange process in a solvent recovery system for acetone-benzol dewaxing unit, mainly solves problems that conventional acetone-benzol dewaxing unit could not fully utilize heat of fluid, and distillation rate of heat exchange dissolvant is relatively low. The invention introduces stream of mixture containing solvent A into middle part of a first time evaporation tower T1, overhead stream Ia and stream A are discharged out of system after two heat exchanges, pot stream is introduced into middle part of second time evaporation tower T2; after evaporation of stream Ib in second time evaporation tower T2, overhead stream IIIa sequentially exchanges heat at least once with stream Ib, then exchanges heat with stream A at least twice then is discharged out of the system, tower pot stream IIIb enters middle part of fourth evaporation tower T4; after evaporation of stream IIIb in fourth time evaporation tower T4, overhead stream IVa is discharged out of the system, tower pot stream enters upper portion of fifth evaporation tower T5; after evaporation of stream IVb in fifth time evaporation tower T5, overhead stream Va is discharged out of the system, tower pot stream Vb sequentially exchanges heat with stream Ib at least once, and exchanges heat with stream A at least once, then is discharged. The scheme solve the problems and can be used in industrial production of solvent recovery system for acetone-benzol dewaxing unit.

Description

technical field [0001] The invention relates to a heat exchange method in a solvent recovery system of a ketone-benzene dewaxing device. Background technique [0002] The ketone-benzene dewaxing unit is a processing unit that improves the low-temperature flow state of lubricating oil. The unit removes the wax in the raw material, and the product is dewaxed oil and oily wax. Some devices reduce the oil content in oily wax to produce wax with low oil content. The device with this function is called ketone-benzene dewaxing and deoiling combined device. The dewaxed oil and deoiled wax of the device are intermediate products for the production of lubricating oil, wax or food grade wax. [0003] In the dewaxing (deoiling) production process, in order to reduce the viscosity of raw materials and improve the separation performance of oil and wax, it is necessary to add a diluent solvent during the production process, generally a mixture of methyl ethyl ketone and toluene, which is ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C10G73/23C10G21/28
Inventor 吴思明
Owner SINOPEC SHANGHAI ENG