Tin-containing molecular sieve catalyst for hydration of ethylene oxide to prepare ethylene glycol and method of use

A technology for ethylene oxide and catalyst, which is applied to a tin-containing molecular sieve catalyst for preparing ethylene glycol by hydration of ethylene oxide and its application field, can solve the problems of high water ratio, environmental pollution, high energy consumption and the like, and achieves the preparation process. Simple, low-cost, selectivity-enhancing effect

Active Publication Date: 2016-06-29
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can solve the problems of high water ratio, high energy consumption and environmental pollution in the traditional ethylene glycol preparation process. The catalyst has strong acidity and excellent stability. In the reaction of preparing ethylene glycol by direct hydration of ethylene oxide, Under the conditions of close to room temperature (40°C) and low water ratio (for example, the molar ratio of water to epoxy compound is 2), the conversion rate of ethylene oxide of more than 99% and the selectivity of ethylene glycol of more than 99% can be obtained

Method used

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  • Tin-containing molecular sieve catalyst for hydration of ethylene oxide to prepare ethylene glycol and method of use
  • Tin-containing molecular sieve catalyst for hydration of ethylene oxide to prepare ethylene glycol and method of use
  • Tin-containing molecular sieve catalyst for hydration of ethylene oxide to prepare ethylene glycol and method of use

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The preparation method of the catalyst that is used for the direct hydration of epoxy compound to prepare ethylene glycol provided by the invention comprises the following steps:

[0034] Step 1) SiO 2 / Al 2 o 3 The original powder of H-SSZ-13 molecular sieve with a value of 27 is first dealuminated under the condition of water vapor or concentrated nitric acid, concentrated hydrochloric acid or oxalic acid solution. The steam treatment conditions are as follows: 1-5g of H-SSZ-13 molecular sieve raw powder is placed in a tube furnace, and then treated with steam under high temperature conditions, the treatment temperature is 500-800°C, and the treatment time is 3- 10h; the acid treatment conditions are: put 5-10g of H-SSZ-13 molecular sieve raw powder in a 500ml round-bottomed three-necked flask, then add 100-200ml of concentrated nitric acid, concentrated hydrochloric acid or oxalic acid solution, under the condition of oil bath Perform stirring treatment, the treat...

Embodiment 1

[0044] The preparation process of the 2%Sn-SSZ-13 catalyst used in the present embodiment comprises the following steps:

[0045] 1) In this experiment, the H-SSZ-13 catalyst was used as the original powder, and the silicon-aluminum ratio of the catalyst (SiO 2 / A 2 o 3 ) is 27, and the grain size is 100-500nm. In addition, the XRD results show that the catalyst has a good CHA structure without the presence of heterocrystals (see figure 1 ). In the preparation process of Sn-SSZ-13, a certain amount of H-SSZ-13 raw powder is firstly weighed and treated under the condition of water vapor or concentrated acid. The steam treatment conditions are as follows: the raw H-SSZ-13 molecular sieve powder is placed in a tube furnace, and then treated with steam under high temperature conditions, the treatment temperature is 600 ° C, and the treatment time is 5 hours; the acid treatment conditions are: concentrated nitric acid , concentrated hydrochloric acid or oxalic acid solution ar...

Embodiment 2

[0057] Example 2: This example investigates the effect of different roasting methods, i.e. muffle furnace and vacuum tube furnace roasting at 550°C, on the hydration performance of 2% Sn-SSZ-13 catalyst, and other reaction conditions are the same as in the examples 1 described. The catalytic performance evaluation is shown in Table 2:

[0058] Table 2 The influence of the calcination mode of the catalyst on the process of preparing ethylene glycol by hydration of ethylene oxide

[0059]

[0060] The evaluation results of the catalyst show that the catalyst calcined in the vacuum tube furnace has better performance than the sample directly calcined in the muffle furnace. Depend on figure 2 and image 3 The ultraviolet results show that the tin species in the sample calcined in the vacuum tube furnace mainly exist in the form of four-coordinated tin at 215nm, while a large part of the sample calcined in the muffle furnace is the tin oxide species at 250nm. exist. Tin ox...

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Abstract

The invention relates to a tin-containing molecular sieve catalyst used for preparing ethylene glycol by hydrating ethylene oxide and an application method of the tin-containing molecular sieve catalyst. The tin-containing molecular sieve catalyst is prepared by taking H-SSZ-13 zeolite molecular sieve raw powder as a raw material, carrying out water steam treatment or water steam and acid combined treatment on the raw material, and introducing active central metal in a manner of roasting by a vacuum pipe type furnace. The preparation method comprises the following steps: mixing an H-SSZ-13 zeolite molecular sieve treated by the water steam or acid with an organic metal compound precursor at a ratio and roasting in vacuum. According to the tin-containing molecular sieve catalyst, the problems of high water ratio, high energy consumption, environmental pollution caused in a production process and the like in a traditional process can be solved. According to the catalyst, a carrier is cheap and easy to obtain, a preparation process of the catalyst is simple and the stability of the catalyst is good; and the catalyst has excellent catalyzing activity and selectivity when being applied to a process of preparing ethylene glycol by directly hydrating ethylene oxide under a warm condition, is easy to recycle and can be used for industrial production for preparing ethylene glycol by hydrating ethylene oxide.

Description

technical field [0001] The invention relates to a tin-containing molecular sieve catalyst and a use method thereof. The catalyst can be used for hydration of ethylene oxide to prepare ethylene glycol, and also discloses a use method of the tin-containing molecular sieve catalyst. Background technique [0002] As an important diol, ethylene glycol is mainly used in the production of polyester resins, including fibers, films and engineering plastics. In addition, ethylene glycol is also commonly used as an indispensable raw material for the production of alkyd resins, adhesives, plasticizers, paints, surfactants, and explosives. [0003] There are usually two methods for the hydration of ethylene oxide to prepare ethylene glycol: one is the non-catalytic method, which is also the main method used in industry at present, that is, ethylene oxide and water are directly hydrated to generate ethylene glycol without any catalyst. . The biggest disadvantage of this method is that t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70C07C31/20C07C29/10
CPCY02P20/52
Inventor 戴卫理关乃佳李兰冬武光军唐波
Owner NANKAI UNIV
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