It is normal for chemical and pharmaceutical enterprises to use a variety of solvents in a set: alcohols are used in this workshop, esters are used in that workshop, and chlorinated solvents are used in the cleaning process. If the tail gas collection is mixed together, the recovered condensate will become an inexplicable mixture-it cannot be reused, the take-out cannot be sold at a price, the disposal is hazardous, and the input of the recovery device will be wasted. The correct opening method of mixed solvent tail gas is group collection and quality treatment: group with similar components, and separate treatment with high recovery value. This article describes the principles of grouping collection and the configuration of quality processing.
There are three reasons for grouping: first, the recovery value-the condensate of a single component can be remixed after detection, the mixed condensate should be separated again, and the energy consumption and investment of distillation eat up most of the recovery value; The second is the safety of the medium-the mixed collection of incompatible components, the pipeline may react, crystallize or stratify, and the operation risk increases. Third, the emission caliber-different components have different emission limits, the mixed exhaust gas after mixing is controlled according to the strict limit value, and the device specification is passively enlarged. The group collection unlocks these three things at the collection end, and the later process is simple and the recovery value is guaranteed.
Grouping is based on three principles: medium compatibility priority-components that can react and crystallize will never be mixed, which is the bottom line of safety; Consistency of recovery path-components that can enter the same rectification tower or the same set of back distribution process are grouped, such as alcohol group and ester group; Matching of gas volume and concentration-large quantities of main solvents are grouped separately, and small quantities of components are grouped according to compatibility. After grouping, each group will set up an independent collection pipeline, switch valves and logo management to keep up, check and switch the operation card to write down the valve status, and the anti-mixing connection system does not rely on memory.
The sub-quality treatment is configured according to the group: the alcohol group is condensed and dehydrated in layers, and the condensate is detected and matched back. Ester group condensation and film control, and components with large hydrolysis tendency control residence time; Chlorine group is condensed and recovered separately, and condensate is reused or disposed of according to caliber after detection. The common part of each group is the idea of membrane unit-low concentration tail gas is uniformly enriched and distributed to each group for condensation, and the membrane section is calibrated according to the dominant component. The arrangement of processing units shall be determined according to the site of the plant, leaving maintenance space and room for switching between groups.
There is another detail in the landing of the grouping scheme: the process change should take the grouping list with it-when adding new solvent varieties to the workshop, the compatibility with the existing components should be checked first, and then the decision should be made to belong to the group or to create another group. Only change the process without changing the collection list, mixed connection will start from here. The list is reviewed at least once a year, and the actual medication situation in the workshop is checked one by one. Only when the accounts are consistent can the grouping be worthy of the name.
| Component | Collecting Caliber | Processing Configuration |
|---|---|---|
| Alcohol group | Independent pipeline group | Condensation layered dehydration reallocation |
| Ester group | Independent pipeline group | Condensation and film check |
| Chlorine group | No mixed collection | Separate Condensation Compliance Disposal |
| low concentration tail gas | unified enrichment | Calibration of membrane segment according to dominant component |
| Switching valve | Identity Operation Card Management | Anti-mix connection system |
| Inventory review | Annual checklist | Process change synchronous update |
The difficulty is in the current situation of the pipeline: the pipeline mixed in the early stage should be checked section by section, and the transformation should be taken over again according to the components. First, separate the components with high recovery value and implement them step by step, without having to be in place in one step.
Compatible small batch components are merged into large groups for collection, and those with too small quantities are entrusted for disposal according to compliance collection; for small batches with separate processing units, the investment is usually not fair.
Yes. The rubber organic vapor membrane has the ability to enrich most organic components, but the parameters are calibrated according to the dominant component, and the pressure difference and enrichment effect are checked when the medium is switched, and the incompatible components are still separated.
This article by LuoyangWohong PetrochemicalEquipment Co., Ltd. arranges that the company provides design, manufacturing and operation and maintenance services for condensation recovery, membrane separation recovery and complete solvent recovery devices for chemical and pharmaceutical enterprises. If you need process evaluation or scheme configuration, please contact and exchange.
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