Methyl Mercaptan Drying via Azeotropic Distillation
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Solution Overview
Problem
Current methods for drying methyl mercaptan, such as using molecular sieves, are inefficient and lead to the formation of undesirable byproducts like dimethyl sulfide, and are affected by traces of methanol, resulting in high production costs and safety risks due to residual water content.
Innovation Solution
Azeotropic distillation is employed to separate methyl mercaptan from water, maintaining controlled drying conditions and avoiding the regeneration cycles of molecular sieves, thereby reducing water content to less than 1500 ppm and minimizing byproduct formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If molecular sieves are used for drying methyl mercaptan, then water content is reduced, but undesirable byproducts like dimethyl sulfide are formed and regeneration requires high temperatures
Solution Approach 1:
The patent changes the drying mechanism from adsorption (molecular sieves) to azeotropic distillation, utilizing the specific boiling point characteristics of the methyl mercaptan-water mixture. By operating at controlled temperatures and pressures where the azeotrope forms, the system achieves efficient water removal without the harmful side effects of molecular sieve regeneration, such as high temperature byproduct formation.
Solution Approach 2:
The patent exploits the phase transition behavior of the methyl mercaptan-water system during azeotropic distillation. The mixture forms an azeotropic vapor phase that condenses to give a water-free liquid phase, utilizing vapor-liquid equilibrium and phase separation to achieve drying without the need for high-temperature regeneration cycles.
2Manufacturing precision
If molecular sieves are used for drying methyl mercaptan, then water is removed, but traces of methanol drastically reduce water adsorption capacity and increase regeneration frequency
Solution Approach 1:
The patent changes the drying mechanism from adsorption (molecular sieves) to azeotropic distillation, utilizing the specific boiling point characteristics of the methyl mercaptan-water mixture. By operating at controlled temperatures and pressures where the azeotrope forms, the system achieves efficient water removal without the harmful side effects of molecular sieve regeneration, such as high temperature byproduct formation.
Solution Approach 2:
The azeotropic distillation process is self-regulating and does not require external regeneration intervention. The system continuously separates water from methyl mercaptan through vapor-liquid equilibrium, eliminating the need for periodic regeneration cycles that are required for molecular sieves when methanol contamination occurs.
3Manufacturing precision
If conventional drying methods are used, then water content is reduced, but production costs increase due to frequent regenerations and byproduct formation
Solution Approach 1:
The patent changes the drying mechanism from adsorption (molecular sieves) to azeotropic distillation, utilizing the specific boiling point characteristics of the methyl mercaptan-water mixture. By operating at controlled temperatures and pressures where the azeotrope forms, the system achieves efficient water removal without the harmful side effects of molecular sieve regeneration, such as high temperature byproduct formation.
Solution Approach 2:
The azeotropic distillation process operates continuously without interruption for regeneration cycles. The vapor-liquid equilibrium process maintains continuous water removal from the methyl mercaptan stream, eliminating the intermittent downtime and operational costs associated with molecular sieve regeneration cycles.
4Ease of operation
If high residual water content is present in methyl mercaptan, then equipment clogging occurs due to solid hydrate formation at temperatures below 16°C
Solution Approach 1:
The patent changes the drying mechanism from adsorption (molecular sieves) to azeotropic distillation, utilizing the specific boiling point characteristics of the methyl mercaptan-water mixture. By operating at controlled temperatures and pressures where the azeotrope forms, the system achieves efficient water removal without the harmful side effects of molecular sieve regeneration, such as high temperature byproduct formation.
Solution Approach 2:
The azeotropic distillation process performs preliminary water removal during the distillation operation itself, ensuring that the methyl mercaptan product leaves the system with water content below the threshold that would cause hydrate formation and equipment clogging during subsequent storage and transport at lower temperatures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process effectively reduces water content in methyl mercaptan to less than 1500 ppm, maintains consistent drying methods, and avoids the formation of unwanted byproducts like dimethyl sulfide, making it more environmentally friendly and economical.
Implementation Method 1
The present invention relates to a process for drying methyl mercaptan, notably by azeotropic distillation
Implementation Method 2
Methyl mercaptan and water can form an azeotropic mixture, preferably a heteroazeotrope
Data Source
AI summary
The present invention relates to a process for drying methyl mercaptan, notably by azeotropic distillation, comprising the following steps:1) a stream (A) comprising methyl mercaptan and water is introduced into a distillation column (1);2) said stream (A) is distilled in said column (1);3) the distillate (B) is recovered in gaseous form, preferably at the top of the column;4) the distillate (B) is condensed, preferably in a condenser (2), so as to obtain a condensate (C) in liquid form;5) said condensate (C) is separated, preferably using a decanter (3), so as to obtain two separate liquid phases:an aqueous phase (D); andan organic phase (E) comprising methyl mercaptan;6) all or part of the organic phase (E) is optionally introduced into the distillation column (1) as reflux; and7) a stream (F) comprising the dried methyl mercaptan is recovered, preferably at the bottom of column (1).The present invention also relates to processes for producing methyl mercaptan comprising said drying process.