Generating type novel production technology of formaldehyde

Abstract

The invention provides a generating type novel production technology of formaldehyde. The technology is characterized in that heat source steam with high pressure first enters into a screw generating set, and the remaining heating steam is used for a formaldehyde production steam system; the residual heat can also be sent to a next stage of screw generator. The total generating capacity can meet the electricity for production and can be connected to the grid to supply more than 60% of power. The invention can be applied in the production of formaldehyde, and saves 100% of power; for production of per ton of formaldehyde, 750 kg / t of by-product steam can be produced, and 52 kwh / t of power can be generated; the production of formaldehyde consumes 20 kwh / t of power, and 32 kwh / t of power can be connected to the grid for external supply. A formaldehyde device with annual output of 50000 tons is equipped with a 350 kw waste heat generator to realize annual grid combined power generation capacity of 1600000 kwh, annual self consumption power of 1000000 kwh for production and annual total power generation capacity of 2600000 kwh.

Description

Technical field [0001] The invention proposes a new process for producing formaldehyde with power generation. In the common silver-based formaldehyde production process in the chemical industry, three types of air, methanol, water vapor, or four gases intervening in the tail gas are heated and mixed, and then enter the reactor. Under the action of a catalyst at a high temperature of 650 ° C, the methanol oxidative dehydrogenation chemical reaction produces formaldehyde. The gas is then physically absorbed by adding water through the absorption tower, and the pipeline pump is circulated to cool down and repeatedly absorb water in the absorption tower in the reverse direction to reach the required liquid formaldehyde concentration of 37-55%. The absorption tower is set up in multi-stage series, and the liquid is sucked from the bottom of the tower by the circulation pump, and the liquid is cooled by the condenser, and then sent to the upper part of the tower top, and sprayed fro...

AI Technical Summary

Problems solved by technology

[0007] The problem with the traditional formaldehyde process is that the amount of steam used is large and the amount of steam is small, and the 0.4MPa±0.5MPa pressure steam of the formaldehyde production system is an extremely low-quality heat source, and the traditional process technology cannot be developed and utilized.

[0008] All formaldehyde exhaust gas can only produce steam. If the excess steam has no other use, it has to be discharged, which wastes both water and electricity.

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