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haozi029228金虫 (正式写手)
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防腐剂（preservatives）是一类能够防腐杀菌、抑制微生物繁殖生长的物质。本文合成了几系列广谱、高效的食品和化妆品防腐剂，对其合成工艺进行了研究。开展了适当规模的中试放大实验，获得了较为成熟的中试技术。为系列产品的工业化提供了可能。并借助红外、元素分析等技术对合成产物进行了定性、定量分析。全文共分为五章，分别包括以下主要内容： 第一章为绪论。首先简要介绍了防腐剂的历史概况及研究进展，并结合本实验室的实际条件，提出本论文的研究设想。 第二章 介绍了Germall系列防腐剂的制备方法。其中重点介绍本类防腐剂的干燥工艺，发展了一种新的干燥工艺，为本类化合物的干燥提供了新思路。 第三章 介绍了尼泊金酯系列（甲、乙、丙、丁）防腐剂的合成方法。考察不同催化剂、催化剂浓度、反应时间和酸醇比等反应条件的影响。对合成过程中常见的带水、结晶、变色等问题进行了深入探究并提出了新的解决方法。 第四章 研究了水溶性改性尼泊金酯系列（甲、丙）防腐剂的合成方法。考查了原料配比、反应温度和加料方式等因素的影响，确定了最佳工艺条件。并参照药典标准对合成产物进行表征。 第五章小结本论文的工作，提出将要进行的研究工作计划。 关键词：防腐剂；合成；最佳工艺条件；Germall系列；尼泊金酯系列；改性水溶性尼泊金酯系列；分析表征；药典标准； |
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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ...
haozi029228(金币+80,VIP+0):xiexie 4-13 16:20
haozi029228(金币+80,VIP+0):xiexie 4-13 16:20
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The preservatives is a kind of material which can prevent corrosion,kill bacteria and inhibit the growth of microorganisms.In this article ,we synthesized several series broad spectrum, highly effective food and cosmetics antiseptic, and researched its synthesis process.A suitable scale experimental enlargement experiment had been carried out,and obtained a relatively mature pilot technique for the industrialization of the series products.A qualitative and quantitative analysis of the synthetic product had been done by the use of infrared and elemental analysis technologies. The full text altogether is divided into five chapters, including the following main elements: Chapter 1. introduction.briefly introduced the history of preservatives and research progress, and put forward the idea of this thesis research with the actual conditions of the laboratory . Chapter 2. introduced the Preparation method of the Germall series preservatives,of which mainly introduces the drying process,and has developed a new drying method,provided a new drying way for this kind of compounds. Chapter 3. introduced the Preparation method of the Nipagin ester series (A,B, C,D) preservatives.researched the different catalysts, catalyst concentration, reaction time and acid to alcohol ratio, such as the effects of reaction conditions. we have taken a further exploration and proposed a new solution of the of common water-borne, crystal, discoloration and other issues in the Synthesis process Chapter 4. researched the synthesis of the water-soluble modified Nipagin ester series (A, C) preservatives. Examined the ratio of raw materials, reaction temperature and feeding mode and other factors to determine the best process conditions.and characterized the synthesis products by the Pharmacopoeia standards . Chapter 5. Summary the work of this thesis, and put forward the work plan of the research which will be carried out. Key words: preservatives; synthesis; optimum conditions; Germall series; Nipagin ester series; modified water-soluble ester series Nipagin; analysis of characterization; Pharmacopoeia standards; |
2楼2009-04-12 02:30:00
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haozi029228(金币+10,VIP+0):xiexie 4-13 16:20
haozi029228(金币+10,VIP+0):xiexie 4-13 16:20
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Abstract Preservative is a type of substance which could prevent corrosion, kill bacteria and inhibit the growth of microorganisms. In this article ,we synthesized several series of food and commetics preservatives with broad spectrum and highly- effectiveness, and the synthetical process was also investigated. A pilot scale research was performed and thus the optimum parameters were obtained, which laid a good foundation for the industrial production of preservative series. In addition, the identification and quantitative analysis of the preservative series were carried out with the aid of infrared and elemental analysis technologies. The whole paper is divided into five chapters that covering the following five areas: Chapter 1. Introduction. In this chapter, the history of preservatives and research progress were briefly introduced. Basing on the actual condition of the laboratory, the tentative concept and ideas were also put forward. Chapter 2. The detailed preparation process of Germall series preservative were introduced. The emphasis of this chapter was put on the drying technology of preservatives. A new type of drying technology was introduced, which provided a new effective approach in the drying of preservatives. Chapter 3. The preparation method of the Nipagin ester series (A,B, C,D) preservatives was investigated. The influence of different catalysts, catalyst concentration, reaction period and ratio of acid to alcohol on the final products were studied, respectively. Common problems in synthetical process such as water-borne, crystal, discoloration etc. were discussed in depth and new resolutions were also proposed. Chapter 4. The synthesis of the water-soluble modified Nipagin ester series (A, C) preservatives was investigated. The influence of raw materials, reaction temperature and feeding mode on the final products were studied, and the optimum conditions were attained. The final products were characterized refering to the Pharmacopoeia standards . Chapter 5. The summary of this paper was made and related research plan was raised. Key words: preservatives; synthesis; optimum conditions; Germall series; Nipagin ester series; modified water-soluble ester series Nipagin; analysis of characterization; Pharmacopoeia standards; [ Last edited by zhaomei2007 on 2009-4-13 at 14:42 ] |
3楼2009-04-12 13:09:57
 [ Last edited by zhaomei2007 on 2009-4-12 at 13:33 ] |
4楼2009-04-12 13:30:22
bluelu1984
金虫 (小有名气)
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haozi029228(金币+10,VIP+0):xiexie 4-13 16:20
haozi029228(金币+10,VIP+0):xiexie 4-13 16:20
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Preservatives (preservatives) is a kind of antiseptic sterilization can inhibit the growth of micro-organisms breeding material.In this paper, several series of synthetic broad-spectrum, high efficiency food and cosmetics preservatives, its synthesis process was studied.we Carried out the appropriate size to enlarge the pilot experiment, to obtain a relatively mature technology in the test.For the industrialized products possible.And by infrared, elemental analysis technologies such as synthetic products on the qualitative and quantitative analysis. The full text is divided into five chapters, respectively, include the following main elements: Chapter 1. introduction.briefly introduced the history of preservatives and research progress, and put forward the idea of this thesis research with the actual conditions of the laboratory . Chapter 2. introduced the Preparation method of the Germall series preservatives,of which mainly introduces the drying process,and has developed a new drying method,provided a new drying way for this kind of compounds. Chapter 3. introduced the Preparation method of the Nipagin ester series (A,B, C,D) preservatives.researched the different catalysts, catalyst concentration, reaction time and acid to alcohol ratio, such as the effects of reaction conditions. we have taken a further exploration and proposed a new solution of the of common water-borne, crystal, discoloration and other issues in the Synthesis process Chapter 4. researched the synthesis of the water-soluble modified Nipagin ester series (A, C) preservatives. Examined the ratio of raw materials, reaction temperature and feeding mode and other factors to determine the best process conditions.and characterized the synthesis products by the Pharmacopoeia standards . Chapter 5. Summary the work of this thesis, and put forward the work plan of the research which will be carried out. Key words: preservatives; synthesis; optimum conditions; Germall series; Nipagin ester series; modified water-soluble ester series Nipagin; analysis of characterization; Pharmacopoeia standards |
5楼2009-04-12 14:11:35