Distillation: processes – separatory – Particular type of heating
Reexamination Certificate
1998-01-28
2001-04-10
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
Particular type of heating
C202S158000, C202S266000, C203S008000, C203SDIG002, C261S114100, C261S114400, C261S114500, C562S600000
Reexamination Certificate
active
06214174
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a purifier and a purifying method for polymerizable organic compounds. Specifically, the present invention relates to a purifier and a purifying method with which polymerizable organic compounds (organic compounds which are easily polymerized) such as acrylic acid or methacrylic acid are efficiently purified by distillation or other processes, by effectively avoiding polymerization of the polymerizable organic compounds.
BACKGROUND OF THE INVENTION
Generally, purifying a polymerizable organic compound (an organic compound which is easily polymerized) such as acrylic acid or methacrylic acid, for example, by distilling it by the use of a distiller in the presence of a polymerization inhibitor, so as to transform it into products, is widely practiced in industrial fields.
When a polymerizable organic compound is distilled by the use of a conventional distiller, the polymerizable organic compound is substantially retained, in a liquid form, on a surface of a distiller constituent member (for example, a tray supporting member) of the distiller. Therefore, the retained liquid, that is, the polymerizable organic compound, is polymerized by, for example, heat application. As a result, a polymer is formed.
Therefore, in the distiller, a strainer is provided at a predetermined position so that the polymer is removed from the polymerized organic compound taken out of the distiller. Besides, the operation of the distiller is suspended at regular intervals for dismantling and checking of the distiller, so that the polymer adhering to inner surfaces of the distiller is washed away.
However, since a great amount of the polymer of the polymerizable organic compound is produced in the conventional distiller, cleaning of the strainer and the distiller has to be frequently conducted. In short, such a conventional distiller has a drawback in that efficient purification of a polymerizable organic compound is impossible.
Therefore, there has risen a demand for a purifier and a purifying method with which polymerization of the polymerizable organic compounds is effectively avoided when the polymerizable organic compounds are purified by distillation or other processes so that efficient purification is performed.
SUMMARY OF THE INVENTION
The inventors eagerly studied a purifier and a purifying method with which a polymerizable organic compound could be efficiently purified. As a result, it was found that by controlling substantial retention of a liquid containing a polymerizable organic compound on a purifier constituent member inside the purifier, polymerization of the polymerizable organic compound was effectively prevented, thereby enabling effective purification of the same. In addition, it was also found that to control the substantial retention of the liquid, a liquid passing part for allowing the liquid to flow from the constituent member downward may be provided in the purifier constituent member inside the purifier. The present invention was completed based on this finding.
The first object of the present invention is to pro vide a purifier with which polymerization of a polymerizable organic compound is effectively avoided when the polymerizable organic compound is purified by distillation or other processes so that efficient purification is performed.
To achieve the first object, a purifier of the present invention for purifying a polymerizable organic compound is characterized in comprising a liquid passing part provided in a purifier constituent member inside the purifier, the liquid passing part allowing liquid containing the polymerizable organic compound to flow from the constituent member downward, so as to avoid substantial retention of the liquid on the constituent member.
With the above arrangement, the liquid containing the polymerizable organic compound is allowed to smoothly flow from the constituent member downward through the liquid passing part, thereby causing no substantial retention of the liquid on the constituent member. As a result, polymerization which tends to occur when the liquid is retained on the surface of the constituent member thereby being heated is effectively prevented. Therefore, efficient purification of the liquid, that is, the polymerizable organic compound, is ensured.
The second object of the present invention is to provide a purifying method with which polymerization of a polymerizable organic compound is effectively avoided when the polymerizable organic compound is purified by distillation or other processes so that efficient purification is performed.
To achieve the second object, a purifying method of the present invention for purifying a polymerizable organic compound, which uses a purifier incorporating a constituent member in which a liquid passing part is formed, is characterized in comprising the step of allowing liquid containing the polymerizable organic compound to flow from the constituent member downward through the liquid passing part, so as to avoid substantial retention of the liquid on the constituent member.
By the aforementioned method, the polymerization which tends to occur when the liquid is retained on the constituent member thereby being heated can be effectively avoided, and as a result the liquid, that is, the polymerizable organic compound, can be efficiently purified.
For a fuller understanding of the nature and advantages of the invention, reference should be made to the ensuing detailed description taken in conjunction with the accompanying drawings.
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Arakawa Kazukiyo
Matsumoto Hajime
Manoharan Virginia
Nippon Shokubai Co. , Ltd.
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