PL402054A1 - Method for phosgenation of toluenediamine (TDA) in the gas phase reactor in the special construction - Google Patents

Method for phosgenation of toluenediamine (TDA) in the gas phase reactor in the special construction

Info

Publication number
PL402054A1
PL402054A1 PL402054A PL40205412A PL402054A1 PL 402054 A1 PL402054 A1 PL 402054A1 PL 402054 A PL402054 A PL 402054A PL 40205412 A PL40205412 A PL 40205412A PL 402054 A1 PL402054 A1 PL 402054A1
Authority
PL
Poland
Prior art keywords
reactor
phosgene
shielding
amine
fed
Prior art date
Application number
PL402054A
Other languages
Polish (pl)
Inventor
Jerzy Bałdyga
Magdalena Jasińska
Stefan Szarlik
Magdalena Dzięgielewska
Piotr Lewandowski
Arkadiusz Sławatycki
Wojciech Chrupała
Jacek Stuczyński
Lech Ruczyński
Lucjan Wójcik
Original Assignee
Zakłady Chemiczne Zachem Spółka Akcyjna
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zakłady Chemiczne Zachem Spółka Akcyjna filed Critical Zakłady Chemiczne Zachem Spółka Akcyjna
Priority to PL402054A priority Critical patent/PL402054A1/en
Priority to PCT/EP2013/076601 priority patent/WO2014091011A1/en
Publication of PL402054A1 publication Critical patent/PL402054A1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C263/00—Preparation of derivatives of isocyanic acid
    • C07C263/10—Preparation of derivatives of isocyanic acid by reaction of amines with carbonyl halides, e.g. with phosgene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/26—Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J4/00—Feed or outlet devices; Feed or outlet control devices
    • B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
    • B01J4/002—Nozzle-type elements

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Przedmiotem wynalazku jest sposób fosgenowania TDA w fazie gazowej w specjalnej konstrukcji reaktorze. Sposób, który w wyniku odpowiedniego wymieszania reagentów doprowadza do uzyskania wysokiej selektywności przebiegu reakcji fosgenowania TDA do TDI. Sposób polega na tym, że stosuje się takie przepływy fosgenu i roztworu aminy z gazem inertnym przez doprowadzenie roztworu aminy i gazu inertnego rurą o odpowiedniej średnicy, a fosgenu dyszami o takich średnicach aby liczba Craya-Curtet'a była wyższa od 0,75, korzystnie od 2, a liczba Reynoldsa Re? była wyższa od 200. W reaktorze zastosowane jest również dozowanie fosgenu osłonowego podawanego na ściankę reaktora na wysokości wylotu par aminy i więcej niż jeden strumień dodatkowego fosgenu osłonowego podawanego na ściankę reaktora, poniżej wylotu par aminy. Fosgen osłonowy podawany jest do reaktora przez szczeliny pierścieniowe co powoduje, że średnica reaktora rozszerza się. Fosgen osłonowy podawany jest do reaktora do strefy reakcji przez szczelinę pierścieniową o takiej średnicy, aby uzyskać prędkość 3-krotnie większą niż prędkość strumienia aminy. Natomiast doprowadzenie dodatkowych strumieni fosgenu osłonowego i wielkość tych strumieni jest tak dobrana aby wartość naprężeń ścinających na wewnętrznej ściance reaktora miała wartość co najmniej 3 Pa, a odległość pomiędzy poszczególnymi doprowadzeniami nie była większa niż 50 cm.The present invention relates to a method of TDA phosgenation in a gas phase in a special reactor design. A method which, as a result of proper mixing of the reagents, results in high selectivity of the TDA phosgenation reaction to TDI. The method consists in using such phosgene and amine solution flows with inert gas by feeding the amine and inert gas solution with a pipe of suitable diameter and phosgene with nozzles of such diameters that the Cray-Curtet number is higher than 0.75, preferably from 2, and Reynolds number Re? was higher than 200. The reactor also uses metering of shielding phosgene fed to the reactor wall at the height of the amine vapor outlet and more than one stream of additional shielding phosgene fed to the reactor wall, below the amine vapor outlet. Shielding phosgene is fed into the reactor through annular gaps, which causes the reactor's diameter to expand. Shielding phosgene is fed to the reactor into the reaction zone through an annular gap of such a diameter as to obtain a speed three times higher than the speed of the amine stream. In contrast, the supply of additional shielding phosgene streams and the size of these streams is selected so that the shear stress value on the inner wall of the reactor is at least 3 Pa, and the distance between individual inlets is not greater than 50 cm.

PL402054A 2012-12-14 2012-12-14 Method for phosgenation of toluenediamine (TDA) in the gas phase reactor in the special construction PL402054A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL402054A PL402054A1 (en) 2012-12-14 2012-12-14 Method for phosgenation of toluenediamine (TDA) in the gas phase reactor in the special construction
PCT/EP2013/076601 WO2014091011A1 (en) 2012-12-14 2013-12-13 A method of toluene diamine (tda) phosgenation in the gaseous phase in a specifically constructed reactor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL402054A PL402054A1 (en) 2012-12-14 2012-12-14 Method for phosgenation of toluenediamine (TDA) in the gas phase reactor in the special construction

Publications (1)

Publication Number Publication Date
PL402054A1 true PL402054A1 (en) 2014-06-23

Family

ID=50933784

Family Applications (1)

Application Number Title Priority Date Filing Date
PL402054A PL402054A1 (en) 2012-12-14 2012-12-14 Method for phosgenation of toluenediamine (TDA) in the gas phase reactor in the special construction

Country Status (2)

Country Link
PL (1) PL402054A1 (en)
WO (1) WO2014091011A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108246235A (en) * 2016-12-29 2018-07-06 重庆长风生物科技有限公司 A kind of nozzle of phosgene vapor phase method continuous production HDI
BR112021008046A2 (en) * 2018-10-31 2021-08-03 Dow Global Technologies Llc method for removing organic monoisocyanates from an organic solvent, and, manufacturing process for polymeric mdi and/or mdi.
EP4378576A1 (en) * 2022-11-29 2024-06-05 Basf Se Apparatus and process for preparing isocyanates

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL169993C (en) * 1972-01-13 1982-09-16 Maruzen Oil Co Ltd METHOD FOR PREPARING TERPHALIC ACID.
DE102006058633A1 (en) * 2006-12-13 2008-06-19 Bayer Materialscience Ag Process for the preparation of isocyanates in the gas phase
US8829232B2 (en) * 2008-08-07 2014-09-09 Basf Se Process for preparing aromatic isocyanates

Also Published As

Publication number Publication date
WO2014091011A1 (en) 2014-06-19

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