Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for the preparation of glycols

A technology of alkylene glycol and reactor, which is applied in the field of diol preparation, and can solve problems such as high cost and inability to make up for economic cost

Inactive Publication Date: 2017-08-08
REPSOL SA
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this trend reaches a limit and in the case of a large excess of water, the increase in the proportion of monoalkylene glycol becomes negligible and does not compensate the economic cost of having to add large amounts of water (which must be removed after the reaction)
Water removal (dehydration) after the reaction is energy intensive and therefore costly

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for the preparation of glycols
  • Method for the preparation of glycols
  • Method for the preparation of glycols

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1

[0049] Example 1 and Comparative Example 1: Thermal Hydration of Propylene Oxide (PO) Using a Single Reactor

[0050] The operation of a single reactor hydrohydration process was simulated without a flasher (comparative example 1, ie according to the prior art) and with a flasher (example 1, ie according to the invention).

[0051] refer to Figure 6 Comparative Example 1 (according to the prior art) is described. A single adiabatic tubular plug flow reactor 16 is supplied via line 15 with preheated water 13 (52,500 Kg / hour at 83°C) mixed with PO 14 (13,125 Kg / hour at 15°C). Thus, the molar ratio water:PO is about 9.8:1 (about 20% by weight PO in the feed). The temperature at the reactor inlet was 120°C and at the outlet was 190°C. The product mixture leaves reactor 16 through line 17.

[0052] refer to Figure 7 Example 1 (according to the invention) is described which is similar to comparative example 1 except that a flash evaporator 21 is used and the water 20 thus e...

Embodiment 2 and comparative example 2

[0058] Example 2 and Comparative Example 2: Thermal Hydration of Propylene Oxide (PO) Using Three Adiabatic Tube Plug Flow Reactors

[0059] The operation of three hydrohydration reactors was simulated without a flasher (comparative example 2, ie according to the prior art) and with two flashers (example 2, ie according to the invention).

[0060] refer to Figure 8 Comparative Example 2 (according to the prior art) is described. OP 22 (4,331 Kg / hour at 15°C) and water 42 (22,900 Kg / hour) were supplied to the first adiabatic tubular plug flow reactor 31 to produce feed 23 . Water stream 42 is derived from lower temperature water stream 41 which has been heated by energy exchange with streams (24 and 27) leaving the first and second adiabatic tubular plug flow reactors (31 and 32, respectively) . The temperature of the stream 23 when entering the first reactor 31 is 142°C, while the temperature of the stream 24 leaving the first reactor 32 is 195°C. Once cooled, stream 24...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The present invention is directed to a method for preparing an alkylene glycol comprising hydrating with water an alkylene oxide in a hydrating reactor placed in a reaction zone, said alkylene oxide being in at least 5 wt% with respect to the total feed, characterized in that the product mixture of said hydrating reactor is subject to a dewatering flash process in a flasher.

Description

technical field [0001] The present invention relates to an improved process for hydrating alkylene oxides to obtain the corresponding diols. Background technique [0002] Commercial processes for the preparation of alkylene glycols (eg, ethylene glycol or propylene glycol) involve the liquid phase hydration of the corresponding alkylene oxide. In the present disclosure, "hydration" is understood as a process in which alkylene oxides are reacted with water in a catalytic or non-catalytic process without the use of other intermediates such as carbonates. The reaction typically requires temperatures of 100°C to 200°C, and it is also known as "hydration". Therefore, in the present disclosure, "hydration" and "hydration" are considered equivalent unless otherwise indicated. [0003] The reaction is generally carried out at a pressure sufficient to maintain the reactants in the liquid phase, usually from 5 bar to 50 bar depending on conditions (eg water excess, temperature). Du...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/10C07C29/76C07C31/20C07C41/02C07C41/40C07C43/11
CPCC07C29/106C07C29/76C07C41/02C07C41/40C07C31/205C07C43/11C07C29/80C07C31/202
Inventor 朱安·佩德罗·佩雷斯巴伦西亚费利克斯·费尔南德斯比利亚尔
Owner REPSOL SA