Title:
RAW MATERIAL FEEDER AND N-VINYLCARBOXYLIC ACID AMIDE PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2020/110615
Kind Code:
A1
Abstract:
Provided is a raw material feeder that can be operated stably and continuously over a long period, that supplies a raw material to a plurality of evaporation tubes in a falling film evaporator at a steady raw material distribution thereby suppressing the problem of a pyrolysis reactor being blocked by deposits. Also provided is an N-vinyl carboxylic acid amide production method. The raw material feeder for supplying, as the raw material, a liquid compound by distributing the liquid compound to the plurality of evaporation tubes 8 in the falling film evaporator, comprises: a main body unit 51 including a plurality of communication holes 50 respectively facing the plurality of evaporation tubes 8; a limiting orifice 7 housed in the interior of each of the communication holes 50, having an orifice opening 7a; a liquid supply tip 6 housed in the interior of each of the communication holes 50 so as to face the limiting orifice 7 on the upstream side of the limiting orifice 7, and having a hole part 6a facing the orifice opening 7a; a first O-ring 10 fitted externally on the side surface of the liquid supply tip 6 and sandwiched by the side surface of the liquid supply tip 6 and the inner surface of the corresponding communication hole 50; and a second O-ring 11 sandwiched by the liquid supply tip 6 and the limiting orifice 7 in such a manner that the orifice opening 7a is situated in the inner region thereof.
Inventors:
TANAKA NAOYUKI (JP)
KAKO TOSHIHIRO (JP)
SEITOH MASAAKI (JP)
KOBAYASHI TAKAMITSU (JP)
KAKO TOSHIHIRO (JP)
SEITOH MASAAKI (JP)
KOBAYASHI TAKAMITSU (JP)
Application Number:
PCT/JP2019/043186
Publication Date:
June 04, 2020
Filing Date:
November 05, 2019
Export Citation:
Assignee:
SHOWA DENKO KK (JP)
International Classes:
B01D1/22; B01J4/00; C07C231/12; C07C233/05; F28D3/02
Domestic Patent References:
| WO2017002494A1 | 2017-01-05 |
Foreign References:
| JP2007507329A | 2007-03-29 | |||
| JP2006284166A | 2006-10-19 | |||
| JP2017211094A | 2017-11-30 | |||
| JPS60228894A | 1985-11-14 | |||
| JP2013212995A | 2013-10-17 | |||
| JPH04352748A | 1992-12-07 |
Other References:
See also references of EP 3888770A4
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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