PATENT CLAIM ANALYSIS

Application Number: 15758285
Application Type: Utility
Filing Date: 2018-03
Publication Date: 2018-09
Patent Classification: ["422", "234000"]

Abstract:
Method and apparatus that enable the more efficient manufacture of urea are provided. Before unreacted substances are removed from a urea synthesis solution obtained from a stripper, the urea synthesis solution is placed under pressure reduced from the synthesis pressure. Thus, a gas-liquid mixture is obtained. The gas-liquid mixture is heated with a decomposed gas from the stripper using a shell-and-tube heat exchanger, and then introduced into a purification system. In the heating, the gas-liquid mixture is introduced into the shell of the heat exchanger while the decomposed gas is introduced into the tube side of the heat exchanger.

Claim (Index 1):
A urea manufacturing method comprising:\n a synthesis step of reacting carbon dioxide and ammonia in a reactor under a condition of excessive ammonia, thereby providing a synthesis mixture containing urea, ammonium carbamate, water, unreacted ammonia, and unreacted carbon dioxide; a decomposition step of decomposing the ammonium carbamate by heating the synthesis mixture and stripping using at least a portion of raw material carbon dioxide as an auxiliary agent, thereby providing a decomposed gas containing ammonia and carbon dioxide, and a urea synthesis solution containing ammonia, carbon dioxide, water, and urea; a pressure reduction step of placing the urea synthesis solution under reduced pressure, thereby providing a gas-liquid mixture; a heating step of heating the gas-liquid mixture with the decomposed gas; a purification step of separating unreacted substances including ammonia, carbon dioxide, and water from the heated gas-liquid mixture, thereby providing a purified urea and water and recovering the separated unreacted substances; a condensation step of condensing the decomposed gas after heating the gas-liquid mixture in a condenser together with at least a portion of the unreacted substances recovered in the purification step, thereby providing a condensate; and a condensate introduction step of introducing the condensate to the reactor, wherein in the heating step, the decomposed gas is introduced into a tube side of a shell-and-tube heat exchanger while the gas-liquid mixture is introduced into a shell of the shell-and-tube heat exchanger.

Metadata:
- Claim Count in Document: 13.0
- Percentile: 90.0
- Lexical Diversity: 2.03774
- Patent Class: 422.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15758295', '11909765', '11909744', '15692715', '11421002']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.8257765395167805
- 35 USC 102 Novelty (BERT): 0.5417259522890996
- Combined Prediction Score: 0.7973714807940124
- Mean Citation Score: 351.04002599999984
- Max Citation Score: 419.35123
- Similarity Product: 397.6789715408837

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test