Method and apparatus for continuous chemical reactions

• US 5,387,397 A
• Filed: 06/03/1992
• Issued: 02/07/1995
• Est. Priority Date: 10/10/1988
• Status: Expired due to Term

• Current Assignee: Agilent Technologies, Inc.
• Original Assignee: Commonwealth Scientific & Industrial Research Organisation (Commonwealth Of Australia As Represented By Department Of Industry, Innovation, Climate Change, Science, Research And Tertiary Education)
• Inventors: Strauss, Christopher R., Faux, Alan F.
• Primary Examiner(s): McMahon, Timothy M.
• Application Number:
  US07/892,996
• Time in Patent Office: 979 Days
• Field of Search: 546/296, 546/319, 422/129, 422/186, 422/187, 422/198, 219/10.55 R, 219/10.55 A
• US Class Current: 422/129
• CPC Class Codes: B01J 19/126 Microwaves
• CPC Class Codes: B01J 2208/00008 Controlling the process
• CPC Class Codes: B01J 2219/00058 Temperature measurement
• CPC Class Codes: B01J 2219/00065 Pressure measurement
• CPC Class Codes: B01J 2219/00137 Peltier cooling elements
• CPC Class Codes: B01J 2219/1227 Reactors comprising tubes with open ends
• CPC Class Codes: C07C 45/673 by change of size of the carbon skeleton
• CPC Class Codes: C07C 49/794 having unsaturation outside an aromatic ring
• CPC Class Codes: C07C 67/08 by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
• CPC Class Codes: H05B 6/645 using temperature sensors
• CPC Class Codes: H05B 6/806 for laboratory use

Abstract

A method and apparatus of conducting chemical reactions on a continuous basis involving feeding a mixture of reactants through a microwave heating zone and controlling the feed rate, feed pressure or microwave power input such that a desired chemical reaction occurs at a predetermined temperature within the feed. Apparatus for performing the method comprises a pump (105) to feed the reactants through a conduit (102, 103, 104) a section of which (103) passes through a microwave heating apparatus (106, 107). The effluent section (104) of the conduit includes a heat exchanger (109) and pressure control means (110). The apparatus is operated under the control of a microprocessor (112) which allows predetermined operating parameters to be set by an operator.

Claims

1. Apparatus for performing chemical reactions on a continuous basis comprising:

i) liquid transport and containment means for continuously transporting and containing a chemical reaction having an inlet section, an elongated non-linearly disposed intermediate section and outlet effluent section,

ii) supply means for continuously feeding a liquid or slurry at a controllably variable rate through the liquid transport and containment means,

iii) a microwave generator to supply microwave energy to the intermediate section for continuously carrying out a chemical reaction in said intermediate section,

iv) temperature measurement means associated with the intermediate or effluent sections to measure the temperature of the products of a chemical reaction,

v) pressure control means associated with said liquid transport and containment means for controlling the pressure of said liquid or slurry therein,

vi) heat exchange means in the effluent section to cool the effluent feed and entrained reaction products substantially immediately on exit from the intermediate section, and

vii) control means operatively interconnecting said supply means, said microwave generator, said temperature measurement means and said pressure control means to control the chemical reactions.

2. Apparatus as claimed in claim 1 wherein said control means controls variations in the microwave power level by switching the microwave generator on and off.

3. Apparatus as claimed in claim 1 wherein the heat exchange means is comprised of at least one thermoelectric Peltier cooling pad for controlling the cooling temperature.

4. Apparatus as claimed in claim 1 wherein the inlet section of the liquid transport and containment means comprises means for separately feeding different reactants for mixing within the intermediate section.

5. Apparatus as claimed in claim 1 wherein said control means enables the temperature of a reaction to be set at a predetermined value.

6. Apparatus as claimed in claim 5 wherein the control means also allows the pressure of the liquid or slurry to be set to a predetermined value, the feed rate and microwave power being controllably varied to maintain the pressure and temperature substantially at their predetermined set values.

7. Apparatus as claimed in claim 1, wherein said control means is a microprocessor.