The solvent recovery device has recovered the tail gas and purified the condensate, only half of which has been completed-the recovered solvent has to be returned to the production line for use, and the detection and return management is the last kilometer for value realization. This ring tube is not good, the quality fluctuation of the recovered solvent affects the product quality, and the problem cannot be traced back to the batch. After management, each batch of solvent has a detection value, a ledger and a destination, and the quality and audit can be established. In this paper, according to the idea of batch control, the testing items, the proportion of back-to-back distribution and the practice of ledger traceability are clearly explained, and enterprises that do solvent recovery management can establish their own system by comparison.
The detection of recovered solvents is determined according to their uses: the general three items are purity, moisture and acidity, covering the reuse caliber of most solvents; Specific varieties plus special items-chlorine-containing solvents measure acid value and density, ketones measure chromaticity, and esters measure hydrolysates. Testing frequency by batch: basic items must be inspected for each batch, and special items shall be sampled weekly or monthly. The judgment caliber is divided into two grades: the straight-line back-to-back tank that reaches the reuse index; The edge index is used after being degraded or refined. If the standard is not met, the refining process will be carried out without being forced. Write down the judgment standard in the system, and carry out the batch according to the regulations, and the dispute will disappear.
The core of the back-to-back management is the proportion and uniformity: when the recovered solvent is mixed with the purchased new solvent, the mixing ratio is converted according to the measured purity on both sides, not by volume estimation-the purity fluctuation between the recovered batches is not small, according to the fixed volume ratio, the product quality follows. The mixing tank is equipped with circulating mixing and sampling ports, and each batch of mixing is retested once and released after passing the test. Reuse caliber grading for different uses: new solvents or high proportion of recycled products for purity-sensitive processes, and general processes are relaxed. The use of grading without crossing is a key approach to balancing quality and cost.
The ledger is closed-loop by batch: each batch records the source process, recovery date, quantity, detection value, return direction and handler, paper and electronic track, electronic version for retrieval. Do material balance on a monthly basis-the amount of solvent input, the amount of recovery and the amount of loss are matched up, and the collection end and the discharge end are checked for abnormal loss. The ledger is also the evidence for communication with the production line: if the downstream has doubts about a certain batch of solvents, the detection value and whereabouts will be called up, and the responsibility will be clearly drawn. The book value of solvent recovery is ultimately based on this set of records.
There is another experience in the implementation of the system: the node of testing and matching is connected to the existing production approval flow, instead of starting another set of processes-batch testing goes with production, matching ratio goes with feeding list, and ledger goes with batch record. If the process is not added, the employees can carry it out. The data left a mark in the production process, and there is no need to go back and make up for the reconciliation at the end of the month.
| Segment | Method | Purpose |
|---|---|---|
| Batch detection | Purity moisture acidity must check | Each batch has data |
| Judgment sub-gear | Reuse downgrade refined third gear | No hard, no misuse |
| Blended back | According to the measured purity conversion | Percentage can be reviewed |
| retest release | Sample and retest after mixing | Guarantees of homogeneity |
| Grading use | Sensitive process caliber strict | quality cost balance |
| Account Closed Loop | Batch destination traceability | Audit reconciliation is well-founded |
First check the device side: membrane recovery rate, distillation parameters and layered dehydration effect will affect the batch fluctuation; Then on the back side, according to the conversion ratio of the measured value, the mixing retest and release, the fluctuation is managed.
Yes, self-inspection of basic items plus regular comparison by external agencies is a common combination. The selection and judgment caliber of the inspection institution is written into the system, and the data is also written into the batch ledger.
It is recommended to keep it in the same cycle as the product quality file, covering at least the traceability validity period; The electronic ledger is easy to retrieve, and the paper key batch samples are kept for supporting evidence, and both tracks are kept.
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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