Polymethoxy dialkyl ether (PODEn) technology

• Technology Introduction

Polymethoxy dialkyl ether (PODEn) is an oligomeric ether compound produced by acetalization reaction. When both ends are capped with methoxy groups, it is called polymethoxy dimethyl ether (DMM3~ 8. The molecular formula is CH3O(CH2O)nCH3). Compared with DME (dimethyl ether) and DMM1 (methoxydimethyl ether), DMM3~8 has higher viscosity and boiling point. Mixing with diesel does not require changing the existing Engine oil supply system. When the number of polycondensation molecular units is controlled at n=3~6, DMM3~8 has good miscibility with diesel, the average cetane number reaches above 76, and the boiling point is between 156~268°C, which is just within the range of diesel and overcomes the problem It overcomes the shortcomings of DME and DMM1 as fuel components and fully meets the requirements of clean diesel blending components. It is considered an environmentally friendly diesel component with great application prospects.

In addition to being an excellent oil additive, DMMn can also be used as an excellent medium-boiling point solvent and has the following advantages: 1. Solubility. It has strong solubility, can be completely miscible with hydrocarbons, and can be miscible with alcohol, ether, acetone, etc. It is a good substitute for aromatic hydrocarbon solvents (toluene, xylene, trimethylbenzene), DMF (dimethylformamide), methanol, ethylene glycol butyl ether, and halogenated hydrocarbons. 2. Amphiphilic solvent. At 16°C, DMMn dissolves 32.3% (WT) in water; water dissolves 4.3% (WT) in the product. At the same time, it has good solubility in alkanes, aromatic hydrocarbons, ethers, ketone aldehyde esters, and halogenated hydrocarbons, and can be used as a compatibilizer. 3. Toxicity: Among organic solvents, the toxicity is the lowest, slightly toxic, sulfur-free and aromatic-free. biodegradable. 4. Low cost.

• Technical features

This technology uses methanol as the basic raw material, oxidizes methanol to prepare formaldehyde and polymerizes formaldehyde and methanol to prepare methylal, and uses methylal and formaldehyde as raw materials to react and distillate to prepare polymethoxydimethyl ether, and uses typical separation technology to separate the product. This process reaction adopts fixed bed catalyst technology, with mild reaction conditions, long service life of the catalyst, high reaction conversion rate and good selectivity.

The technical routes adopted at each stage are as follows:

(1) Adopt silver formaldehyde technology + exhaust gas circulation technology. This technology has been widely used in industrial equipment, and the investment cost is relatively low. The use of tail gas circulation technology can increase the formaldehyde yield.

(2) Methyl synthesis uses catalyst distillation and pressure swing distillation technology to prepare high-concentration methylal. Currently, this technology is mature and operational.

(3) The synthesis of polymethoxydimethyl ether uses methanol as the basic raw material, and formaldehyde and methylal as reaction raw materials to prepare polymethoxydimethyl ether. It has been industrialized and matured and operates stably.

(3) Product indicators

If you need to know more about the polymethoxy dialkyl ether (PODEn) process technology and related issues, please contact us. Hubei Sanli Liquidambar Technology Co., Ltd. specializes in providing polymethoxy dialkyl ether (PODEn) production technology.