TH40872A3 - Production of high purity monoethylene glycol - Google Patents

Abstract

DC60 (15/11/42) What was revealed is a process for the distillation with a monoethylene distillation. High-purity glycol from the aqueous decomposition products of ethylene oxide by pressure dehydration. If so, then it is in the set that Synchronized for vacuum dehydration and sequential purification. Which includes bringing Out of the stream with water which has A monoethylene glycol with a concentration of less than 1% by wt, would be good, it is 0.1% wt. As an alternative within After operations other than that, substances with a comparatively boiling point Medium, and substances with low boiling points will be removed from the system. What was revealed is a process for the recovery of monoethylene. Pure glycol High from ethylene oxide aqueous decomposition products by pressure dehydration If so, then it is in the set that Synchronized for vacuum dehydration and sequential purification. Which includes bringing Out of the stream with water which has A monoethylene glycol with a concentration of less than 1% by wt, would be good at 0.1% by weight during vacuum dehydration. As an alternative within After operations other than that, substances with a comparatively boiling point Medium, and substances with low boiling points will be removed from the system.

Claims (9)

1.Process for the recovery of high purity monoethylene glycol from the product Obtained from hydrolysis of Ethylene oxide by pressure water removal Ideally, it is provided by a coordinated set for vacuum dehydration and a To purify sequentially Which includes Remove the stream containing water containing monoethylene glycol at a concentration of 1% by wt. If so, well, it is 0.1% wt during vacuum dehydration. Which can be selected after the operation other than that Substances with a moderate boiling point And substances with low boiling points are obtained Removal from the system 2. The process as held in claim 1, where vacuum water disposal will Occur in the column for The vacuum water is eliminated (5) and the watery current is removed as a sub stream. Out of the column for vacuum removal of water (5). 3. The process as held in claim 1, where vacuum water disposal will Occur in the column for The vacuum water is removed (5,10) and the watery current is taken out by the current at the top. Out of the column for vacuum water removal (10). 4. The process under which claim is held in claim 3, where it flows at the top of the column. Distilled to make The pure monoethylene glycol (6) will be re-imported. To the column for Remove the vacuum water (10) the last column if it is good. Will enter the middle part of that column And high purity monoethylene glycol is introduced. Removed by bringing out the side of Distillation column for making Purity of Monoethylene Glycol (6) 5. Process under Claim 4 where it flows at the top of the column. Distilled to make The pure monoethylene glycol (6) is 1% to 10% the conductive current. Side-out for monoethylene glycol and / or steps for 1 to 10 separation steps. Ideally, 3 to 6 steps will be arranged between the top of the Distillation column for making Purification of monoethylene glycol (6) and lateral removal. 6. Process for which one of Claim No. 1 to 5 is held, where the base temperature is Of the columns in the column For vacuum water removal (5 10) it is not more than 220 ํ, but if it is good, it is in the range of 120 ํ to 200 ํ. Up to 180 ํ. 7. Process by which one of Claims 1 to 6 is held, where Column for Water removal with pressure (2) or at least a column for pressure removal (2) where one of the coordinated units (2 3 4) is involved for removal with a separation procedure. At least that One step away Ideally, there are 2 to 10 separate steps, ideally 3 to 6 steps and the current segment at the top of the column for efficient dehydration. Pressure with a part for lead Then it will be eliminated from the system. 8. The process as it is held in claim 7, where subjected temperatures are fed into the column. For water removal, the pressure (2) is higher than 80 ํ, but if it is good, it is in the range of 100 ํ to 250 ํ. H and pressure on the part for conduction Out of not less than 1 bar, well, it will range from 2 to 30 bars. 9. The process by which one of Clause 7 or 8 is held that flows at the top of the column for the The water is eliminated by pressure (2), whose part for removal is obtained. Imports into sub-condensers (9a) and / or separators (9), especially steam separators. And gas currents with a large number of secondary elements are removed from the system 1. 0. Process according to one of claim 7 through 9 where the sub-condenser (9a) and separator (9) will be operating to a temperature of 90 ํ. Temperatures in the range of 120 ํ to 250 ํ.