Method for preparing polymethoxy dimethyl ether through reaction and rectification of fixed bed

A polymethoxydimethyl ether, fixed bed reaction technology, applied in catalytic reaction, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems affecting the reaction conversion rate and product yield, reaction conversion rate and The product yield is low, the reaction product and the catalyst are not easily separated, etc., to achieve the effect of uniform distribution of the reaction product, improving the purity and yield, and saving equipment investment

Active Publication Date: 2015-02-18
XIAN SHANGHUA TECH DEV CO LTD
View PDF2 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Nowadays, when polyoxymethylene dimethyl ether is synthesized by a fixed bed reactor, the reactive distillation tower generally does not have a side line reactor, and there are the following problems in actual use: first, the reactor is arranged in the tower body, Make tower volume larger, input cost is higher, and influence reaction conversion rate and product yield (also claim productive rate); The 2nd, the catalyst that is installed in the reactor is difficult for loadin

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
  • Method for preparing polymethoxy dimethyl ether through reaction and rectification of fixed bed
  • Method for preparing polymethoxy dimethyl ether through reaction and rectification of fixed bed
  • Method for preparing polymethoxy dimethyl ether through reaction and rectification of fixed bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Such as figure 2 As shown, the reactive distillation tower of the present invention comprises a rectification tower body arranged vertically and a plurality of side line reactors 2 arranged outside the rectification tower body, and a plurality of side line reactors 2 are composed of Arranged from top to bottom; the rectification tower body includes an upper tower body 1-1, a lower tower body 1-3 located directly below the upper tower body 1-1, and a lower tower body 1-3 connected to the upper tower body 1-1 and the lower tower body 1 The middle tower body 1-2 between -3; the upper part of the upper tower body 1-1 is a cluster rectification section and its lower part is an upper tray layout section, and the cluster rectification section is divided into a plurality of vertical The cluster rectification zone 8 arranged vertically, the upper tray layout section and the top of the upper tower body 1-1 are connected through a plurality of cluster rectification zones 8, and e...

Embodiment 2

[0099] Step one, such as figure 1 As shown, pass the paraformaldehyde into the preheater 9 to preheat to 65°C, then mix the methylal and the preheated paraformaldehyde in the mixer 10 according to the molar ratio of 1.0:1 and send them into The etherification reaction is carried out in a fixed-bed reactor 11 filled with a catalyst; the temperature of the etherification reaction is 50° C., and the reaction pressure is 0.10 MPa; the catalyst is a strongly acidic styrene-based cation exchange resin modified with rare earth elements, The preparation method of the catalyst is as follows: a lanthanum nitrate aqueous solution with a mass concentration of 1% and a basic cerium nitrate aqueous solution with a mass concentration of 1% are uniformly mixed according to the mass ratio of lanthanum nitrate and basic cerium nitrate at a ratio of 1:1, and then Strongly acidic styrene-based cation-exchange resin (purchased from Jiangsu Sekesaisi Resin Co., Ltd.) was placed in the mixed solutio...

Embodiment 3

[0104] Step one, such as figure 1 As shown, the paraformaldehyde is passed into the preheater 9 to preheat to 80°C, and then the methylal and the preheated paraformaldehyde are mixed uniformly in the mixer 10 according to the molar ratio of 2.0:1 and then sent into The etherification reaction is carried out in a fixed-bed reactor 11 filled with a catalyst; the temperature of the etherification reaction is 120° C., and the reaction pressure is 0.55 MPa; the catalyst is a strongly acidic styrene-based cation exchange resin modified with rare earth elements, The preparation method of the catalyst is as follows: a lanthanum nitrate aqueous solution with a mass concentration of 3% and a basic cerium nitrate aqueous solution with a mass concentration of 2% are uniformly mixed according to the mass ratio of lanthanum nitrate and basic cerium nitrate at a ratio of 1.5:1, and then Strongly acidic styrene-based cation-exchange resin (purchased from Jiangsu Sekesaisi Resin Co., Ltd.) was...

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

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing polymethoxy dimethyl ether through reaction and rectification of a fixed bed. The method comprises the following steps: (1) preheating trioxymethylene, uniformly mixing the preheated trioxymethylene and methylal, and feeding the trioxymethylene and the methylal which are uniformly mixed into a fixed bed reactor for an etherification reaction; (2) feeding materials after the etherification reaction into a reaction rectifying tower for the reaction and the rectification, and discharging PODE2-8 from the tower bottom of the reaction rectifying tower; (3) transporting the PODE2-8 to a dewatering tower loaded with a 3A molecular sieve for dehydration, then transporting the dehydrated PODE2-8 into a first refining tower, transporting materials which are discharged from the tower bottom of the first refining tower into a second refining tower, discharging PODE3-5 from the tower top of the second refining tower, and discharging PODE6-8 from the tower bottom of the second refining tower. When the method disclosed by the invention is used for preparing the PODE3-8, the yield of the polymethoxy dimethyl ether can reach 95%, wherein the products of the PODE3-8 can reach 80%-95%, and after refinement, the PODE3-5 of which the quality purity reaches 99.9% can be obtained.

Description

technical field [0001] The invention belongs to the technical field of polyoxymethylene dimethyl ether preparation, and in particular relates to a method for preparing polyoxymethylene dimethyl ether by fixed-bed reactive distillation. Background technique [0002] Polyoxymethylene dimethyl ether (PODE 3-8 ) is an internationally recognized new type of environmentally friendly diesel oxygen-containing component that can reduce fuel consumption and reduce exhaust pollution. PODE 3-8 The cetane number is greater than 76, the oxygen content is 47% to 50%, and the boiling range is 153°C to 268°C. It has excellent mutual solubility with diesel oil and can be blended into diesel oil in any proportion to increase the oxygen content of diesel oil and improve Diesel combustion performance, reducing vehicle exhaust pollution by more than 50%, especially greatly reducing SO in exhaust 2 , NO X , CO and CmHn emissions. [0003] Polyoxymethylene dimethyl ether (PODE 3-8 ) can be us...

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
IPC IPC(8): C07C43/30C07C41/56C07C41/58
CPCB01J31/08B01J2231/00C07C41/56C07C41/58C07C43/30
Inventor 刘红喜陈华卢建华郁刘军
Owner XIAN SHANGHUA TECH DEV CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap