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A kind of clean diesel oil additive polymethoxy formal separation method

A polymethoxymethylacetal and separation method technology, which is applied in chemical instruments and methods, petroleum industry, preparation of organic compounds, etc., can solve the problems of long process flow, high process energy consumption and high energy consumption, and achieve The effect of simple process flow, reasonable energy utilization and low process energy consumption

Active Publication Date: 2018-02-02
EAST CHINA ENG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process route is relatively simple, and the cost of the catalyst is low, but the process energy cannot be rationally utilized, and the energy consumption is high, and cyclohexane is used as the extraction agent, which poses a great threat to the environment and personal safety, and a small amount of extraction is introduced into the discharged wastewater. agents, additional equipment is required to handle
[0008] In summary, in view of the problems of long process route, high process energy consumption, and difficulty in the treatment of three wastes in the current synthesis process route of DMMn, considering the market factors of DMMn and the defects existing in the current process of DMMn, it is necessary to develop a A simple process route, low energy consumption, environmentally friendly DMMn synthesis and separation method

Method used

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  • A kind of clean diesel oil additive polymethoxy formal separation method
  • A kind of clean diesel oil additive polymethoxy formal separation method
  • A kind of clean diesel oil additive polymethoxy formal separation method

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Experimental program
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Effect test

Embodiment 1

[0073] The raw material of this separation method comes from the upstream synthesis reactor, and the synthetic crude product mainly contains DMM 3~10 and water, with a small amount of DMM 1~2 And unreacted methanol and formaldehyde. The synthetic crude product is sent to the light removal tower C-10001 by the synthetic product delivery pump.

[0074] Light removal tower C-10001 operating pressure normal pressure ~ 0.5Mpa. The light removal tower adopts two heat sources, among which the first reboiler E-10002 of the light removal tower uses steam or other heat sources, and the second reboiler E-10003 of the light removal tower uses the overhead steam of the dilute aldehyde concentration tower as the heat source. Separation by rectification, methanol, formaldehyde, DMM in raw materials 1～2 Light components are removed, and the crude product in the tower kettle is mainly DMM 3～10 , containing a small amount of water. The crude product is boosted by the product tower feed pum...

Embodiment 2

[0079] A kind of clean diesel oil additive polymethoxy formal separation method,

[0080] Include the following steps:

[0081] (1) The synthetic crude product from the upstream reaction system is sent to the light removal tower system to remove methanol, formaldehyde and DMM 1～2 Light components, the light components extracted from the top of the tower go to the methanol recovery tower, and the crude DMMn product in the tower kettle goes to the product tower system;

[0082] (2) In the product tower system, the water in the raw DMMn product is removed, and the trace DMM produced at the top of the tower is 2～3 The waste water goes to the sewage treatment plant, and the liquid in the bottom of the tower is cooled to obtain DMM, a polymethoxymethyl acetal product that meets the requirements. 3～8 ;

[0083] (3) The methanol recovery tower system fully recovers unreacted methanol, the recovered methanol extracted from the top of the tower is returned to the upstream reaction sy...

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Abstract

The invention discloses a separation method of polymethoxy methylal. Overhead vapor of a dilute aldehyde concentrating tower is used as a heat source of a light component removal tower reboiler in the process, and the product tower adopts a tower bottom reboiler and a middle reboiler, thereby adopting two heat sources with different grades; and due to the adoption of the high / low-pressure thermal coupling rectification and middle reboiler technique, the process has the advantages of very low energy consumption and reasonable energy utilization. The raw material methanol consumption is low, the DMM3-8 purity in the product is high, no high-toxicity extractant is introduced in the process, the formaldehyde content in the generated wastewater conforms to the environment-friendly discharge standard, and thus, the method is an environment-friendly technique which is suitable for large-scale technical production.

Description

technical field [0001] The invention belongs to the field of clean diesel additives, in particular to a method for separating polymethoxymethylal, a clean diesel additive. Background technique [0002] The quality of diesel for vehicles in my country is relatively low, mainly manifested in sulfur content, cetane number and aromatics content. Due to the poor quality of oil products and incomplete combustion, motor vehicle exhaust pollution is serious, which is also one of the main factors for the formation of urban smog due to the high PM2.5 value. For this reason, my country promulgated a new vehicle diesel standard (GB19147-2013) in 2013, but the existing refining process is difficult to produce vehicle diesel that meets the requirements. China's diesel vehicles fully implement the National IV emission standards, and it is imperative to upgrade the quality of oil products. [0003] Polymethoxymethylal (DMMn, n=3~8) is a new type of environmentally friendly fuel blending c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/30C07C41/58C10L1/185
CPCC07C41/58C10L1/1852C10L2200/04C10L2230/22C07C43/30
Inventor 余葆如冯玉峰韩谛胡文生
Owner EAST CHINA ENG SCI & TECH