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Technique for synthesizing polyformaldehyde dimethyl ether

A technology of polyoxymethylene dimethyl ether and process method, which is applied in the field of synthesizing polyoxymethylene dimethyl ether, can solve the problems of high cost of synthetic process products, high catalyst cost, low yield, etc., to avoid channeling short circuit and high reactivity , fast mass transfer effect

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is the high product cost of polyoxymethylene dimethyl ether synthesis process, low yield and high catalyst cost. A new process for synthesizing polyoxymethylene dimethyl ether is provided, which has the advantages of low product cost High yield and low catalyst cost

Method used

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  • Technique for synthesizing polyformaldehyde dimethyl ether
  • Technique for synthesizing polyformaldehyde dimethyl ether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Catalyst preparation:

[0037] Mix 24.81 grams (on a dry basis, the same below) ZSM-5 molecular sieve powder (d90 = 15 microns, Si / Al = 150, Nankai University Catalyst Factory product) with 74.44 grams of deionized water, wet ball mill to form a molecular sieve Slurry, molecular sieve particle diameter d90=6 micron, add polyethylene glycol solution 0.75 gram (the weight percentage of polyethylene glycol in the solution is 2% by weight) in slurry, the addition of this solution is 3% by weight of molecular sieve weight, Stir for 25 minutes to obtain catalyst coating preparation mixture slurry (coating slurry), the molecular sieve content in the slurry is 24.81% by weight.

[0038] Mix 1 liter of honeycomb carrier (cordierite honeycomb carrier, 5CM in diameter, 5CM in length, 400 cpsi per square inch of cross-section) with 2 liters of coating slurry, and use air with a flow rate of 10 m / s at room temperature (25 °C) Purging the pores of the carrier for 15 mi...

Embodiment 2

[0042] [embodiment 2] preparation of catalyst:

[0043] Except coating active component is MCM-56 (Si / Al=150), other process is identical with embodiment 1.

[0044] Catalyst evaluation:

[0045] Same as Example 1. The experimental results are listed in Table 1.

Embodiment 3

[0047] Catalyst preparation:

[0048] Except that the active component of the coating is zeolite beta (Si / Al=150), other processes are the same as in Example 1.

[0049] Catalyst evaluation:

[0050] Same as Example 1. The experimental results are listed in Table 1.

[0051]

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Abstract

The invention relates to a technique for synthesizing polyformaldehyde dimethyl ether, particularly a technique for synthesizing polyformaldehyde dimethyl ether from methanol, methylal and polyformaldehyde. The technique is divided into a reaction region and a rectification region. The process of the reaction region comprises the following steps: vaporizing methylal, mixing, sending into a regular-structure fixed-bed reactor (7), and reacting to generate a mixture containing the target product polyformaldehyde dimethyl ether. The rectification region sequentially comprises three separation rectification towers connected in series and a product storage tank (28). The three separation rectification towers connected in series are sequentially a first separation rectification tower (17), a second separation rectification tower (22) and a third separation rectification tower (25). The technique is characterized in that by adopting the regular-structure catalyst and reactor, the catalyst consumption is greatly saved, the catalyst and reactor are simple for amplification and flexible for operation, and the technique has lower methylal yield and higher polymer product selectivity on the premise of keeping higher reaction activity and product selectivity.

Description

technical field [0001] The invention relates to a process for synthesizing polyoxymethylene dimethyl ether, in particular to a process for synthesizing polyoxymethylene dimethyl ether with a regular structure catalyst and a reactor. Background technique [0002] Polyoxymethylene dimethyl ether, or Polyoxymethylene dimethyl ethers (PODE), is a general term for a class of substances, and its simplified formula can be expressed as CH 3 O(CH 2 O) n CH 3 , with higher cetane number (> 40) and oxygen content (42-51%). When the value of n is 1, polyoxymethylene dimethyl ether is methylal. Using methylal as a vehicle fuel additive component can also improve energy utilization efficiency and reduce exhaust emissions, but it is still easy to cause gas locks. When the value of n is 2-6, its physical properties and combustion performance are very close to those of diesel oil, which better solves the defects of traditional additives used as vehicle diesel blending components. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/30C07C41/56B01J29/40B01J29/70
CPCB01J29/40B01J29/70B01J29/7007B01J29/7038C07C41/56C07C43/30
Inventor 高晓晨杨为民高焕新顾军民
Owner CHINA PETROLEUM & CHEM CORP
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