Manufacturing Process
AssigneeFujifilm Imaging Colorants Limited
InventorsDavid Martin Payne, Douglas John Edwin Spencer, John Heathcote Atherton, Zachary Richard Meadows
Life of this patent
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Abstract
A process for the preparation of a desired chemical compound in a continuous reactor in which a part of the product stream exits the reactor and part of the product stream is recycled around the reactor in order to reduce the amount of buffer that would otherwise be required.
Claims19
A process for the preparation of a desired chemical compound in a continuous reactor which comprises the following stages:
- (i) mixing together in a reaction zone of the reactor at a pH within a desired pH range a first stream comprising a first compound and a second stream comprising a second compound capable of reacting with the first compound such that a product stream containing the desired chemical compound is formed;
- (ii) removing part of the product stream from the reactor, leaving part of the product stream in the reactor;
- and
- (iii) recirculating the product stream remaining in the reactor from stage (ii) into the reaction zone thereby assisting maintenance of the desired pH range during a subsequent performance of stage (i).
A process according to any one of the preceding claims wherein the desired chemical compound has acid and/or basic groups and acts as a buffer for maintaining the desired pH range.
A continuous reactor comprising one or more pipes defining a continuous loop and a means for recirculating liquid therein, the loop comprising:
- a. an entry port for a first stream comprising a first compound;
- b. an entry port for a second stream comprising a second compound capable of reacting with the first compound;
- c. a reaction zone where the first and second compounds are capable of reacting to form a product stream containing a desired chemical compound;
- and
- d. an exit port for the product stream;
- characterised in that the reactor further comprises a means for adjusting the amount of product stream which exits the loop relative to the amount of product stream recirculated to the reaction zone.
(canceled)
Dependencies are inferred from the claim text.