Synthesis of DMC through oxidative carbonylation of methanol
The wastewater mainly contains a trace amount of methanol and, after it is biochemically treated and meets standards, it is discharged. The CO2 content of waste gas exceeds 99 percent (v/v), with the remainder being N2 and O2. The waste gas can either be emitted or recycled. There is no waste residue.
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Brief introduction

Dimethyl carbonate (DMC) is a very useful, low-toxicity organic chemical raw material. Its molecular composition is –CO, -CH3, -OCH3, and -COOCH3 and it can handle carbonylation, methylation, methoxylation, and carboxylation reactions. In chemical synthesis, it is a perfect substitute for phosgene, dimethyl sulfate, and methyl halide as a carbonylating agent and methylating agent. DMC results in many synthesized chemical products such as polycarbonate, isocyanate, carbamate, malonate, and urethane. It can be used as a gasoline additive with high oxygen content, better than MTBE.

Technical features and capacity

This simple process uses CH3OH, CO and O2 as raw materials and directly synthesizes DMC, with low toxicity, easy acquisition of raw materials, low cost, and high product quality.

Capacity: 10~100kt/a

Technical indicators (at 10kt/a, for example)  

Item

Unit

Consumption quota

Methanol

t

0.80

CO (95%)

Nm3

448

O2 (99%)

Nm3

248

Catalyst

kg

2.0

Cooling water

t

480

Electricity

kWh

480

Steam

t

10

Soft water

t

2.7

Instrument air

Nm3

600

Waste treatment

The wastewater mainly contains a trace amount of methanol and, after it is biochemically treated and meets standards, it is discharged. The CO2 content of waste gas exceeds 99 percent (v/v), with the remainder being N2 and O2. The waste gas can either be emitted or recycled. There is no waste residue.

 

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