提高乙二醇紫外透过率的研究

【作者】 林玉玲；

【导师】 卑凤利； 陈群； 何明阳；

【作者基本信息】 南京理工大学 ， 应用化学， 2004， 硕士

【摘要】 乙二醇是一种重要的化工原料，它目前最大的用途是用于生产聚酯。当它作为聚酯原料时，对其纯度要求很高，紫外透过率须达到一定的标准。本课题用离子交换树脂对乙二醇杂质进行富集，用盐酸甲醇液洗脱，然后用色质联用仪器进行分析，检测出了十几种杂质。本论文研究表明：造成乙二醇紫外透过率低的原因在于它含有两大类吸收紫外光的杂质，一类是含一或多个碳原子的有机羧酸及其衍生物，另一大类是含一到两个羰基的醛和酮。要有效提高乙二醇的紫外透过率，必须同时去除这两类杂质。 本课题用阴离子交换树脂和阳离子交换树脂串联吸附催化乙二醇含水样，即含约15％质量分数水的粗乙二醇，之后再进行精制得到的乙二醇成品紫外透过率在220nm、275nm和350nm处分别高于90％、95％和98％。更多还原

【Abstract】 Ethylene glycol is an important chemical product. Now a particularly important use of ethylene glycol is in the production of polyester fibers. Ethylene glycol used in the manufacture of polyester fibers generally must be of exceptionally high purity and has to meet a rigid UV transmittance specification. In this paper, impurities were concentrated on an ion-exchange resin, then eluted by hydrochloric acid-methanol solution, and detected by gas chromatography-mass spectrometry. More than ten impurities were detected. The paper pointed out: there are two kinds of impurities which affect commercial ethylene glycol UV transmittance. One kind is organic acids, which contain one or more carbon atoms, and their derivates, the other is aldehyde and ketone which contain one or two carbonyls. In order to improve the UV transmittance of the ethylene glycol, these two kinds of impurities must be removed at the same time.In this paper, a bed of anion exchange resin followed by a bed of cation exchange resin was used to absorbed and catalyzed the aqueous mixture of ethylene glycols, which contain about 15 wt% water, then the product stream which has a reduced UV light absorbance was sent to be distilled. The final monoethylene glycol product has a UV transmittance over 90% at 220nm, 95% at 275nm and 98% at 350nm.更多还原