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Composite inhibitor for inhibiting hanging rubber in isoprene extraction rectification process
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A compound inhibitor, extractive distillation technology, applied in the direction of hydrocarbons, distillation purification/separation, hydrocarbon purification/separation, etc. The effect of changing the molecular structure of the polymer, reducing the molecular weight of the polymer, and enhancing the dispersing ability
Active Publication Date: 2013-05-01
NINGBO JINHAI CHENGUANG CHEM
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[0010] 2. The reboiler of the second extractive distillation column is prone to gelation and coking
[0011] 3. The circulating solvent cooler is easy to glue, which increases the heat transfer resistance
[0013] 1. The function of polymerization inhibitor is single, lacking the function of cleaning and dispersing, and controlling the molecular weight
[0014] 2. Insufficient high temperature inhibition performance of inhibitors
[0015] 3. The free colloids are easy to gather and increase, forming a continuous hanging glue
[0024] The above patents mainly involve the performance of polymerization inhibitors, and rarely involve the influence of polymer molecular structure, molecular weight, physical properties (viscosity, etc.) on equipment performance and operating cycle
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Embodiment 1
[0085] In the production preparation stage, nitrogen purging is carried out on the equipment of the second extraction and rectification system, the residual water in the equipment is blown dry, and the air in the equipment is replaced, so that the dew point of the gas phase in the equipment is ≤ -20°C, and the oxygen content is ≤ 10ppm.
[0086] Establish solvent circulation among the second extractive distillation tower, desorptiontower, and vacuum desorptiontower, add component D, the addition amount is 0.2% of the total amount of solvent, continue for 24 hours, and treat the inner surface of the equipment to form a surface protection layer .
[0087] Then, carry out circulation solvent heat transfer, solvent circulation volume Fm 3 / h, temperature 60-80°C, add component B, the addition amount is 0.15L / h×F, continue for 24 hours; continue to add component B, the addition amount is 0.15L / h×F, add component A, add The volume is 0.36L / h×F for 24 hours.
[0088] After the ab...
Embodiment 2
[0095]In the production preparation stage, nitrogen purging is carried out on the equipment of the second extraction and rectification system, the residual water in the equipment is blown dry, and the air in the equipment is replaced, so that the dew point of the gas phase in the equipment is ≤ -20°C, and the oxygen content is ≤ 10ppm.
[0096] Establish the extraction solvent circulation between the second extractive distillation tower, desorption tower, and vacuum desorption tower, add component D, the addition amount is 0.2% of the total amount of extraction solvent, continue for 24 hours, and treat the inner surface of the equipment. A protective film is formed on the inner surface of the
[0097] Then, carry out circulation solvent heat transfer, solvent circulation volume Fm 3 / h, temperature 60-80°C, add component B, the addition amount is 0.15L / h×F, continue for 24 hours; continue to add component B, the addition amount is 0.15L / h×F, add component A, add The volume is...
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Abstract
The invention relates to a composite inhibitor for inhibiting hanging rubber in an isoprene extraction rectification process. The composite inhibitor is characterized in that the composite inhibitor comprises a component A, a component B and a component C, wherein the component A is a mixed solution prepared by dissolving 4-hydroxy-2,2,6,6-tetramethyl piperidine-1-oxygen, ethanolamine and a first additive in toluene; the additive is isobutyl alcohol and / or isopropanol; the component B is a 20-30wt% sodiumnitriteaqueous solution; the component C is a mixed solution prepared by dissolving polyisobutylene succinimide and a second additive in toluene; and the second additive is chosen from alpha-methyl styrene and / or styrene. The inhibitor is simple in using method and good in high-temperature inhibition effect, and has a retarding function; the polymer molecular weight and the performance are controlled; and the concentration of a polymer can be effectively prevented.
Description
technical field [0001] The invention relates to a polymerization inhibitor, in particular to a composite inhibitor for inhibiting gum formation in the extraction and rectification process of isoprene. Background technique [0002] Polymerized grade isoprene is an important polymerized monomer for the manufacture of isoprene rubber, SIS (styrene-isoprene-styrene block copolymer), butyl rubber and other polymer materials. At present, the separation and extraction of polymer-grade isoprene for domestic industrial use from ethylenecracking carbon five, most of them use DMF (N,N-dimethylformamide) extraction and distillation method, and some use ACN (acetonitrile) method. [0003] The main process of producing isoprene by DMF extractive distillation includes a first extractive distillation unit, a second extractive distillation unit, and a solvent regeneration unit. The main task of the first extractive distillation unit is to obtain chemical grade isoprene with a content of mo...
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Application Information
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