Tubular reactor polymerization initiator injector device, tubular reactor for continuous polymerization of olefins, and a process for production of polymers and copolymers of ethylene

• US 10,829,568 B2
• Filed: 12/22/2015
• Issued: 11/10/2020
• Est. Priority Date: 12/22/2015
• Status: Active Grant

• Current Assignee: Braskem SA
• Original Assignee: Braskem SA
• Inventors: Dotti, Eduardo Jose, Gandolfi, Paulo Henrique Konat, Abella, Vitor Dal Bo
• Primary Examiner(s): Nguyen, Vu A
• Application Number:
  US16/065,275
• Publication Number:
  US 20190322771A1
• Time in Patent Office: 1,785 Days
• CPC Class Codes: A62C 31/02 Nozzles specially adapted for fire-extinguishing
• CPC Class Codes: B01F 25/3131 with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
• CPC Class Codes: B01F 25/4335 Mixers with a converging-diverging cross-section
• CPC Class Codes: B01J 19/2465 externally, i.e. the mixture leaving the vessel and subsequently re-entering it
• CPC Class Codes: B01J 19/26 Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
• CPC Class Codes: B01J 2204/002 the feeding side being of particular interest
• CPC Class Codes: B01J 4/002 Nozzle-type elements nozzle-type reactors B01J19/26
• CPC Class Codes: B05D 1/26 performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
• CPC Class Codes: C08F 10/00 Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
• CPC Class Codes: C08F 10/02 Ethene
• CPC Class Codes: C08F 2/00 Processes of polymerisation
• CPC Class Codes: C08F 2/01 characterised by special features of the polymerisation apparatus used
• CPC Class Codes: C08F 4/32 Organic compounds
• CPC Class Codes: C08L 23/04 Homopolymers or copolymers of ethene
• CPC Class Codes: C09D 123/06 Polyethene

Abstract

The present invention refers, in its generality, to a tubular reactor for homo or copolymerization of olefins, with one of more initiator injection devices. The invention also refers to an initiator device in a process fluid stream in a reactor polymerization reactor, and to a process for the production of polymers and copolymers of ethylene, particularly low density polymers (LDPE), that use the said device.

Claims

1. An injector device of polymerization initiator in a tubular reactor comprising:

a constriction to the flow of a process fluid, said constriction being provided with a throat at its median point, said constriction being provided with a tubular through-bayonet transversal to the whole of the throat, and said through-bayonet having at least one injection orifice along the throat of the constriction.

2. The device according to claim 1, wherein the at least one injection orifice along the throat is selected from among the following:

one sole orifice at the median point or near the median point;

two orifices distanced symmetrically or approximately symmetrically from the median point;

two or more orifices at the proximities of the median point;

any number of orifices, with symmetric or non-symmetric spreading, at the proximities of the median point.

3. The device according to claim 1, wherein the at least one injection orifice is oriented downwards relative to the flow of the process fluid.

4. The device according to claim 1, wherein the device is located between a portion of piping upstream thereof, which intercepts the constriction in an inlet of the process fluid, and a portion of piping downstream thereof, which intercepts the constriction in an outlet of the process fluid.

5. The device, according to claim 4, wherein the distance between the inlet and the bayonet is the same distance that exists between the bayonet and the outlet.

6. The device according to claim 4, wherein the dimensions of the constituent parts of the injector are selected from among one or more of the alternatives:

linear extension of the constriction;

50 to 500 mm;

external diameter of the bayonet;

6 to 20 mm;

linear extension of the throat;

6 to 20 mm;

internal diameter of the bayonet;

0.5 to 5 mm;

diameter of the throat;

20 to 200 mm;

diameter of the inlet and of the outlet;

30-200 mm;

diameter of the tube of the reactor being equal upstream and downstream of the injection device;

distance between the inlet and the throat;

25-200 mm;

distance between the outlet and the throat being the same distance between the inlet and the throat.

7. The device according to claim 1, wherein the device follows an equation C_vtotal+0.0165R_total≤

0.1, wherein C_vtotal and R_total represent an index of mixture and index of recirculation, respectively.

8. A tubular reactor for continuous polymerization of olefins comprising one or more injection devices according to claim 1.

9. A process of production of polymers and copolymers of ethylene, comprising one or more steps of injection of initiator to a tubular reactor via one or more injection device(s) according to claim 1.