DMMn has the properties of alkane and ether with high solubility, low viscosity and toxicity. In recent years, it has been used as an environment-friendly organic solvent to replace the traditional solvent with high pollution, toxicity and cost.
DMMn is used as a solvent and thinner in the paint industry and can replace solvents such as 200# and 150#. See table 2.1-1 for comparison of DMMn and 200# solvent properties, and table 2.1-2 for comparison of DMMn and 150# solvent properties.
Comparison of DMM3-4 and 200# environmental solvent properties
Comparison of DMM2-3 and 150# environmental solvent properties
Comparison of basic physical and chemical properties of DMMn and diesel oil
Production process diagram
General formula of reaction mechanism
By adjusting the ratio of reaction materials, reaction time and temperature, and changing the type of catalyst to achieve different Q, the product structure can be adjusted. Different Q values correspond to different product structures, as shown in the figure below (illustrated by Q=1.5 and 4) :
Secondary reactions in the process flow are as follows:
Note: reaction (9) will obviously takes place when reaction temperature is higher than 200 ℃. A definite concentration of formic acid is required for the reaction (10) to occur appreciably.
Advantages of Dolton process:1,Using formaldehyde solution as raw material, the process is short.
2,High process elasticity and mild reaction conditions.
3,The process wastewater meets the clean discharge standard, and the biochemical treatment of sewage is simple with low consumption.
4,Catalytic distillation reaction system, high conversion rate, low reaction material circulation.
5,Low equipment requirement and low investment.
6,The catalyst has mild service condition and long service life.
7,High energy utilization rate and low energy consumption (see table 2.4-1 for consumption index).
8,In this process, the product structure of M2/ M3-5 / M6-8 can be adjusted by adjusting the composition of raw materials, reaction time, type of catalyst and the product can be changed in line with market demand.
Consumption index of raw materials and utilities
Note: some of the patents have been transferred to Helipont, the overseas sales company of Dolton, both companies share the patents.
Dolton patent list
- About Dolton & Helipont
- Formaldehyde production technology
- DMMn production technology
- Paraformaldehyde production technology
- Methylal production technology
- Hexamine production technology
- Acetaldehyde production technology
- Pentaerythritol production technology
- Trimethylolpropane production technology
- Neopentyl glycol production technology
- Trimeraldehyde production technology
- 1, 4-cyclohexane dimethanol CHDM production technology
- EPP production technology
- Production technology of concentrated formaldehyde made from dilute formaldehyde