PATENT CLAIM ANALYSIS

Application Number: 16095785
Application Type: Utility
Filing Date: 2018-10
Publication Date: 2019-05
Patent Classification: ["210", "638000"]

Abstract:
The present application discloses a method for producing acrylate with low pollutant discharge. The method has the advantages of high raw material utilization efficiency, low concentration, low salinity and low toxicity of wastewater pollutant, easy treatment of wastewater and etc.

Claim (Index 20):
A method for producing acrylates with low pollutant discharge comprising the following steps:\n (1) subjecting an acrylic acid, a catalyst which is sulfuric acid or organic sulfonic acid, and a butanol or octanol to an esterification reaction in an esterification reactor to produce an esterified product, the esterification reactor has a salt crystal collection structure; (2) washing the esterified product of step (1) with water to recover the catalyst and the unreacted acrylic acid, and recycling the recovered catalyst and the unreacted acrylic acid back to the esterification reactor; (3) washing the esterified product with an alkali after water washing to further remove the organic acid in the product; (4) rectifying the esterified product after alkali washing and removing the light components and the heavy components to obtain a product; wherein the method further comprises: (5) combining the wastewater from the above esterification reaction, the wastewater produced during the recovery of the catalyst and the unreacted acrylic acid and the wastewater from the alkali washing to produce a wastewater phase, recovering alcohols and esters in the wastewater phase, and then subjecting the wastewater to the pretreatments of cooling, filtration, ion exchange; (6) treating the wastewater after the pretreatment in step (5) by a multi-stage bipolar membrane electrodialysis system to recover the organic acid solution and the alkali solution therein; wherein the multi-stage bipolar membrane electrodialysis system is 2 to 5 bipolar membrane electrodialysis devices using the same type of men brane stack structure; wherein the bipolar membrane electrodialysis membrane stacks employ a structure in which a bipolar membrane-an anion exchange membrane-a cation exchange membrane are alternately arranged, the initial solution in the feed chamber of each stage device is the acrylate wastewater after the pretreatment in step (5); the initial solution in the acid chamber of the first stage device is desalted water or a solution containing a corresponding catalyst, and the initial solution in the alkali chamber is desalted water or sodium hydroxide solution; the initial solution in the acid chamber of the subsequent device is the organic acid solution recovered in the device of the prior stage, and the initial solution in the alkali chamber is the alkali solution recovered in the device of the prior stage; or wherein the bipolar membrane electrodialysis membrane stacks employ a structure in which an anion exchange membrane and a bipolar membrane are alternately arranged, the initial solution in the feed chamber of each stage device is the acrylate wastewater after pretreatment in step (5); the initial solution in the acid chamber of the first stage device is desalted water or a solution containing a corresponding catalyst; the initial solution in the acid chamber of the subsequent device is organic acid solution recovered in the device of the prior stage; (7) subjecting the recovered organic acid solution to an acidification treatment, followed by a dehydration treatment, and then recycling back to the esterification reactor of step (1) for esterification reaction; wherein the recovered alkali solution is used for neutralization of the acidic wastewater from the acrylic acid production, or for the alkali washing of step (3).

Metadata:
- Claim Count in Document: 29.0
- Percentile: 97.0
- Lexical Diversity: 1.40625
- Patent Class: 210.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15139895', '14760635', '10794231', '12084118', '15490549']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7601937362923334
- 35 USC 102 Novelty (BERT): 0.5111079154635707
- Combined Prediction Score: 0.7352851542094573
- Mean Citation Score: 241.61594800000003
- Max Citation Score: 289.6567
- Similarity Product: 218.9024228107035

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test