# US 11,186,542 B2 · Combined apparatus for the synthesis of urea

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- Number: US 11,186,542 B2
- Document ID: US11186542B2
- Status: Granted
- Kind: B2
- Application number: 15/780,552
- Filed: 2017-01-31
- Published: 2019-01-03
- Granted: 2021-11-30
- Earliest claimed: 2016-03-17
- Assignees: Casale SA
- Applicants: Casale SA
- Inventors: Andrea Scotto; Enrico Rizzi
- Web page: https://patentgrep.com/patent/US11186542B2

## CPC

- C07C 273/04: from carbon dioxide and ammonia
- B01D 3/009: {in combination with chemical reactions}
- B01D 5/0015: {Plates}
- B01D 5/006: {with evaporation or distillation}
- B01J 19/0053: {Details of the reactor}
- B01J 19/006: {Baffles}
- B01J 19/244: {Concentric tubes}
- B01J 19/246: {internally, i.e. the mixture circulating inside the vessel such that the upward stream is separated physically from the downward stream(s)}
- B01J 19/0013: {Controlling the temperature of the process}
- B01J 2219/00078: Fingers
- B01J 2219/00081: Tubes
- B01J 2219/00108: involving reactant vapours
- B01J 2219/00159: controlling multiple zones along the direction of flow, e.g. pre-heating and after-cooling
- B01J 2219/00768: vertical
- B01J 2219/00777: horizontal
- B01J 2219/1943: cylindrical
- C07C 273/16: Separation; Purification
- Y02P 20/141: Feedstock
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

Combined apparatus (1) for the synthesis of urea from ammonia and carbon dioxide, comprising an internal wall (3) which delimits two coaxial zones (4) inside the apparatus, operating respectively as reaction (4) and condensation (5) zones, and optionally also comprising a stripping zone and/or a scrubber integrated in the same apparatus.

## Claims

### Claim 1

A combined apparatus for the synthesis of urea from ammonia and carbon dioxide, comprising a shell and comprising a reaction zone and a condensation zone, said two zones communicating with each other and being contained inside said shell,
wherein said reaction zone is arranged coaxially outside of said condensation zone;
wherein cooling elements are arranged in the condensation zone,
wherein said cooling elements comprise a tube bundle having a tube plate; and
wherein the condensation zone is defined in a central region of the apparatus, and the tube plate has a substantially smaller diameter than the diameter of the shell of said apparatus.

### Claim 2 (depends on 1)

The apparatus according to claim 1, wherein said condensation zone has a cylindrical or substantially cylindrical geometry and said reaction zone has an annular or substantially annular geometry, extending around said condensation zone.

### Claim 3 (depends on 1)

The apparatus according to claim 1, comprising an additional internal wall which delimits said reaction and condensation zones inside the apparatus.

### Claim 4 (depends on 3)

The apparatus according to claim 3, wherein:
said condensation zone comprises a cylindrical or substantially cylindrical region which is located on the inside of said additional wall, and
said reaction zone comprises an annular or substantially annular region which extends externally around said additional wall.

### Claim 5 (depends on 4)

The apparatus according to claim 4, wherein:
the condensation zone is represented by a bottom portion of said cylindrical or substantially cylindrical region on the inside of the additional wall, and
the reaction zone comprises a top portion of said region on the inside of the additional wall, above the condensation zone, as well as the annular or substantially annular region which extends around the additional wall.

### Claim 6 (depends on 3)

The apparatus according to claim 3, wherein the reaction zone, having annular or substantially annular geometry, is defined between said additional wall and said shell of the apparatus.

### Claim 7 (depends on 1)

The apparatus according to claim 1, wherein the tubes are bayonet tubes and said tube bundle has a single tube plate.

### Claim 8 (depends on 1)

The apparatus according to claim 1, also comprising a stripping zone and/or a scrubbing zone integrated into said apparatus.

### Claim 9 (depends on 8)

The apparatus according to claim 8, comprising:
a top section which comprises said coaxial reaction and condensation zones, and optionally the scrubbing zone; and
a bottom section which comprises the stripping zone.