Improved ethylene glycol production system

A production system, ethylene glycol technology, applied in the structural field of ethylene glycol collection and flow direction, can solve problems such as unstable process operation, unstable energy source, and increased water content of EG, so as to reduce the amount of tail gas entrainment and avoid instability Performance, stability improvement effect

CN103360211AActive Publication Date: 2013-10-23ZHEJIANG WANKAI NEW MATERIAL
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-10-23

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Abstract

The invention discloses an improved ethylene glycol production system which comprises a first ethylene glycol liquid seal trough, a second ethylene glycol liquid seal trough, a third ethylene glycol liquid seal trough, a fourth ethylene glycol liquid seal trough, an evaporator, an ethylene glycol low-point collecting trough, a separation tower, a recycled ethylene glycol collecting trough and a slurry blending tank, wherein a first heat exchanger is arranged on a pipeline between the outlet of the evaporator and the recycled ethylene glycol collecting trough; a pipeline for fresh ethylene glycol passes through the first heat exchanger and subsequently enters the evaporator; a second heat exchanger is arranged on a pipeline between the outlet of the separation tower and the recycled ethylene glycol collecting trough; a pipeline of the ethylene glycol low-point collecting trough to the separation tower also passes through the second heat exchanger. Compared with the prior art, the improved ethylene glycol production system has the advantages that the stability of density and flow of EG (Ethylene Glycol) is improved, the instability in operation is effectively avoided, and meanwhile the waste heat in a device is sufficiently utilized, and the purposes of reducing the energy consumption and saving the energy are achieved.
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Description

technical field

[0001] The invention relates to a structure for collecting and flowing ethylene glycol in polyester production. Background technique

[0002] A large amount of fresh EG (ethylene glycol) and recycled EG are used in the production of PET equipment. Existing glycol production systems such as figure 1 As shown, it specifically includes a first ethylene glycol liquid seal tank 11a, a second ethylene glycol liquid seal tank 12a, a third ethylene glycol liquid seal tank 13a, a fourth ethylene glycol liquid seal tank 14a, an evaporator 2a, a Glycol low point collection tank 3a, separation tower 4a, recycling ethylene glycol collection tank 5a and slurry preparation tank 6a; the first ethylene glycol liquid seal tank 11a, the second ethylene glycol liquid seal tank 12a are all connected with ethylene glycol The inlet of alcohol low-point collection tank 3a is connected, and is connected with respective plate heat exchanger through respective output pipe respectivel...

Examples

Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] Such as figure 2 As shown, the ethylene glycol production system in this embodiment includes a first ethylene glycol liquid seal tank 11, a second ethylene glycol liquid seal tank 12, a third ethylene glycol liquid seal tank 13, a fourth ethylene glycol liquid seal tank Sealing tank 14, evaporator 2, ethylene glycol low point collection tank 3, separation tower 4, recycled ethylene glycol collection tank 5 and slurry preparation tank 6.

[0023] The first ethylene glycol liquid seal tank 11 and the second ethylene glycol liquid seal tank 12 are all connected to the inlet of the ethylene glycol low point collection tank 3, and are respectively connected to respective plate heat exchangers (not shown in the figure) through respective output pipes. Shown) connection; the third ethylene glycol liquid seal tank 13 and the fourth ethylene g...