环氧乙烷/乙二醇装置二氧化碳吸收系统改造

文章介绍了中国石化扬子石油化工有限公司乙二醇/环氧乙烷装置的二氧化碳脱除系统改造情况,提高了二氧化碳的脱除能力,满足了装置氧化反应系统新型催化剂S-865的使用要求。     

碳酸乙烯酯法合成乙二醇技术概述

本文概述了乙二醇和碳酸二甲酯联产法和碳酸乙烯酯水解法2种碳酸乙烯酯法合成乙二醇的技术情况,并提出了建议.     

乙二醇生产技术及国内外市场分析

介绍了乙二醇的生产技术情况，分析了国内外乙二醇的生产消费现状及市场前景，提出了发展我国乙二醇生产的一些建议。     

聚醚淬火介质的应用研究

利用硬度评定法对聚醚淬火介质的成分进行了优选,结果表明：４５钢试样在浓度为１５％的聚醚水溶液淬火介质中淬火,不但表面硬度高,而且硬度梯度平缓。使用该淬火介质对４５钢轴承套圈淬火,在获得高硬度的同时,显著减小了淬火变形。     

聚酯瓶消费及其回收

综述了世界和各地区ＰＥＴ的消费、回收及其应用状况、未来消费和回收预测,并介绍了聚酯瓶开发和应用新动向。     

煤制乙二醇精馏1,2-丁二醇有效分离的探讨

关于煤制乙二醇精馏1,2-丁二醇有效分离的论述是基于乙二醇精馏原理对乙二醇和1,2-丁二醇进行更有效的分离,达到乙二醇最大程度地回收利用和企业效益的最大化。由于乙二醇与1,2-丁二醇在常压下的沸点相近,采用普通精馏时需要很高的温度和回流比及理论塔板量,从而造成投资大、能耗高。文章介绍通过负压精馏增大组分间的相对挥发度,并采用二次精馏的方法有效分离乙二醇和1,2-丁二醇。     

国内外乙二醇生产发展概况

本文对国内外乙二醇生产技术现状、发展动向、以及市场供需状况作了概要叙述。     

丙二醇单月桂酸酯的增稠性能

丙二醇单月桂酸酯(简称PGM)是一种亲酯性非离子型表面活性剂。通过对PGM在洗涤剂和化妆品的增稠性能研究发现,PGM在甜菜碱和硫酸酯盐表面活性剂体系的洗涤剂中有良好的增稠性能,并且其增稠性能在相同条件下要好于椰子油脂肪酸单乙醇酰胺(CME)增稠剂。在甜菜碱表面活性剂体系和硫酸酯盐表面活性剂体系的洗涤剂中PGM具有良好起泡性能。在甜菜碱、AES-Na和AES-TEA表面活性剂体系的洗涤剂中PGM在低温条件下,体系稳定不会变浑浊。PGM在洁肤类、液洗类和护肤类化妆品中也有良好的增稠性能。     

Cost-analysis model of colonoscopy preparation using split-dose reduced-volume oral sulfate solution (OSS) and polyethylene glycol with electrolytes solution (PEG-ELS)

Objective:

The study aimed to (1) develop a cost model for colonoscopy preparation among patients referred for colonoscopy using split-dose reduced-volume oral sulfate solution (OSS) and generic polyethylene glycol with electrolytes solution (PEG-ELS), (2) examine cost savings associated with OSS vs PEG-ELS, and (3) assess the robustness of the cost model.

Methods:

Efficacy of each agent was based on the results of a 541-patient clinical trial comparing OSS to PEG-ELS. Cleansing agent and colonoscopy procedure costs were calculated from OptumHealth Reporting & Insights claims data for 2010–Q12013. In the model, patients’ colonoscopies were tracked over a 25 or 35 year time period until the patients reached age 75. The difference per patient per year (PPPY) in total cleansing agent and colonoscopy procedure costs over the time horizon between the OSS and PEG-ELS cohort was calculated. One-way sensitivity analyses were conducted to test the robustness of the cost model.

Results:

The model showed lower cost for OSS patients over the time horizon. Total PPPY costs were $280.34 for the OSS cohort and $296.36 for the PEG-ELS cohort, resulting in a cost saving of $16.01 PPPY for the OSS cohort. This was due primarily to OSS patients having fewer colonoscopies (OSS: 0.158 vs PEG-ELS: 0.170 PPPY). Over the time horizon, cost savings of $4 763 335 were observed among 10, 000 OSS patients. Cost savings switched from OSS to PEG-ELS cohort in four cases: (1) base-case cost of a completed colonoscopy decreased by 75%, (2) base-case cost of OSS increased to over $143 per usage, (3) all non-completers were lost to follow-up, and (4) OSS bowel preparation quality dropped below PEG-ELS to 70%.

Conclusions:

From a payer’s perspective, the model showed that the use of OSS as the cleansing agent resulted in potential cost savings compared with PEG-ELS. Cost savings under OSS remained under various sensitivity analyses.     

乙二醇的国内外市场分析

评述了世界乙二醇产能过剩态势,经济衰退对需求带来的影响,并对中国乙二醇市场作出分析,包括持续增长的消费量、高的进口依存度、扩能趋势,并提出了发展建议。