How to deal with excessive acidity in the alkali scrubber tower of VCM plants
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How to deal with excessive acidity in the alkali scrubber tower of a VCM plant?
It is best to disconnect the pipeline leading to the compressor and redirect it to the degassing tank; if necessary, check the pH level of the water inside the tank； Fresh water was added to the water scrubber, and concentrated alkali was added to the alkali scrubber to temporarily prevent acidic gases from entering. If it really doesn’t work, stop the vehicle to check the reason.
1. Check the pH value from after alkali washing to compression in a timely manner; if it is too acidic, an emergency shutdown is required. 2. If the process is not stopped to promptly add alkali to the alkali washing tower, adjust the synthesis ratio, and replace the acid in the water washing tower. 3. Preventive measures: increase the frequency of inspections for the alkali scrubber tower ； Indicator for increasing the lower limit of alkali concentration ； Conduct pH measurements of the alkali scrubber on schedule ； Improve the operating skills of the personnel; under normal circumstances, an acidic bias in the alkali scrubber should be detectable from the DCS data.
However, trace amounts of excess acidity are generally difficult to detect using DCS, as all operational parameters remain within the specified range. It’s a bit acidic right in front of the machine. So I feel that the data display on DCS is a bit delayed. At the site, ensure the alkaline solution circulation rate, oleic acid concentration, etc.
This is a major problem; if not handled properly, the compression equipment will experience leakage
Excess acid condition: 1. Adjust the ratio, and take samples to prevent catalyst poisoning； 2. The alkali solution circulation system quickly replaces the fresh alkali solution online; it is essential to use an excess amount of alkali to prevent corrosion of the equipment ahead of the compressor ； 3. Increase the flow rate of the circulating water used for washing ； The above three points must be carried out simultaneously.
Excess acid condition: 1. Adjust the ratio, and take samples to prevent catalyst poisoning； 2. The alkali solution circulation system quickly replaces the fresh alkali solution online; it is essential to use an excess amount of alkali to prevent corrosion of the equipment ahead of the compressor ； 3. Increase the flow rate of the circulating water used for washing ； The above three points must be carried out simultaneously.
Excess acid condition: 1. Adjust the ratio, and take samples to prevent catalyst poisoning； 2. The alkali solution circulation system quickly replaces the fresh alkali solution online; it is essential to use an excess amount of alkali to prevent corrosion of the equipment ahead of the compressor ； 3. Increase the flow rate of the circulating water used for washing ； The above three points must be carried out simultaneously.
Strictly control the synthesis ratios, enhance the alkaline treatment in the alkali scrubber, and increase acid replacement in the water scrubber