PATENT CLAIM ANALYSIS

Application Number: 15878492
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2019-07
Patent Classification: ["585", "818000"]

Abstract:
The invention relates to a process for recovering methane from digester biogas or landfill gas. More specifically, the invention pertains to biomethane production that substantially removes carbon dioxide from a digester biogas or landfill gas using first, second, and third purification stages each comprising one or more membranes selective for carbon dioxide over methane. A retentate from the first stage is separated by the one more membranes of the second stage into a second state retentate, forming a biomethane product gas. A permeate from the first stage is separated by the one or more membranes of the third stage into a third stage retentate and a third stage permeate. Recovery of methane from the biogas is boosted by feeding the third stage retentate to the first purification stage. The recovery may be optionally further boosted by compressing the second stage permeate with the biogas at a main compressor.

Claim (Index 43):
A method for increasing a recovery of methane in biomethane product gas produced by an existing installation for producing biomethane comprising a source of a biogas, a main compressor, a first purification stage comprising at least one membrane selective for carbon dioxide over methane, a second purification stage comprising at least one membrane selective for carbon dioxide over methane, an inlet of the main compressor being in fluid communication downstream of the source, an inlet of the first purification stage being in fluid communication downstream of an outlet of the main compressor, an inlet of the second purification stage being in fluid communication downstream of a retentate outlet of the first purification stage, a permeate outlet of the second purification stage being in fluid communication with the inlet of the main compressor, said method comprising the steps of:\n providing a high recovery module comprising a secondary compressor and a third purification stage comprising one or more membranes in series or in parallel that are selective for carbon dioxide over methane; placing an inlet of the secondary compressor in downstream flow communication with a permeate outlet of the first purification stage; placing an inlet of the third purification stage in downstream flow communication with an outlet of the secondary compressor; and placing a retentate outlet of the third purification stage in fluid communication with the inlet of the first purification stage.

Metadata:
- Claim Count in Document: 56.0
- Percentile: 86.0
- Lexical Diversity: 2.35821
- Patent Class: 585.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['15711571', '15022309', '15037198', '15462004', '13807831']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7113615472549831
- 35 USC 102 Novelty (BERT): 0.5586619887621173
- Combined Prediction Score: 0.6960915914056965
- Mean Citation Score: 339.920278
- Max Citation Score: 435.2796
- Similarity Product: 368.1828283007383

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