Synthesis and application of triazine drag reducing agent for nature gas pipeline

doi:10.16085/j.issn.1000-6613.2023-0304

Abstract

Abstract:

Traditional methods of increasing transportation needed high costs and complicated constructions, and old pipeline in service could not realize. Also, corrosion existed in pipeline. In order to fulfill no-pressurized increasing transportation at low cost and reducing corrosion for nature gas pipeline, bis-2-dibutylamino-4-N-morpholine-6-N-ethylenediamine-1,3,5-triazine (BDMET) was synthesized using cyanuric chloride and organic amine by nucleophilic substitution reaction. The structure of BDMET was characterized with ¹H nuclear magnetic resonance (¹H NMR) spectroscopy and elemental analysis (EA). As corrosion inhibitor and drag reducing agent, BDMET of methanol solution was infused into nature gas pipeline in field, and drag reducing rate and transmission increasing rate were assayed by field experiment. The results of ¹H NMR and EA tests indicated that the product was the target compound. After infusing into five nature gas pipelines by atomization, the drag reducing rate and transmission increasing rate of the product were 8%—13% and 6%—11%, respectively. Meanwhile, the corrosion inhibition of BDMET reached 85%—86% and the valid time was over 20 days. In addition, the field experiment lasted over 360 days. BDMET synthesized possessed excellent corrosion inhibition property and drag reduction property, and avoided continuous infusing for common corrosion inhibitors. Then, gas inspection proved that the quality of the nature gas was unaffected when BDMET was infused into the pipeline.

Key words: natural gas, molecular synthesis, drag reduction, corrosion, triazine

摘要：

天然气管道传统增输方法投资高、施工复杂，在役旧管线无法增输且管道内部存在腐蚀。为达到经济可行的天然气管道低成本不增压增输和缓蚀的双重目的，应用三聚氯氰和有机胺通过亲核取代反应合成了新型添加剂双-2-二丁基胺基-4-N-吗啉-6-N-乙二胺基-1,3,5-三嗪（BDMET），采用氢核磁共振谱图（¹H NMR）和元素分析（EA）对产品进行结构表征。应用BDMET的甲醇溶液作为缓蚀型减阻剂进行现场加注试验，并评价了产品减阻增输效果和缓蚀效果。¹H NMR和EA表征证明了产品的化学结构。现场采用雾化加注5条集输管线，其减阻率在8%~13%，增输率在6%~11%，缓蚀率维持在85%~86%，有效时间大于20天，累计加剂时间大于360天。合成的BDMET兼有优异的缓蚀与减阻效果，避免了普通缓蚀剂需连续加注的问题，且气体质检证明加注BDMET后对天然气气质无影响。

关键词: 天然气, 分子合成, 减阻, 腐蚀, 三嗪

CLC Number:

O622.6

ZHAO Wei, ZHAO Deyin, LI Shihan, LIU Hongda, SUN Jin, GUO Yanqiu. Synthesis and application of triazine drag reducing agent for nature gas pipeline[J]. Chemical Industry and Engineering Progress, 2023, 42(S1): 391-399.

赵巍, 赵德银, 李世瀚, 刘洪达, 孙进, 郭艳秋. 三嗪型天然气管道缓蚀型减阻剂合成与应用[J]. 化工进展, 2023, 42(S1): 391-399.

Figures/Tables 12

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工艺参数	1号集输管线	2号集输管线	3号集输管线	4号集输管线	5号集输管线
管长/km	125.3	22.6	15	8.8	9.1
管径/mm	457×6.4	273×6.4	200×6.4	168.3×5.6	168.3×5.6
材质	20^#	20^#	20^#	20^#	20^#
输量/10⁴m³·d^-1	50	60	65	1.5	1.0
输送压力/MPa	3.6~4.0	3.6~4.0	1.3	0.72	0.76
初始压降/MPa	1.41	1.43	0.61	0.196	0.198
加注方式	雾化式	雾化式	雾化式	雾化式	雾化式
每次加剂总量/L	401.9	484.0	520.3	9.0	32
加剂流量/L·h^-1	4.17	5.05	5.42	0.09	0.33
每次加剂天数/d	5~6	4~5	4~5	4~5	4~5

工艺参数	1号集输管线	2号集输管线	3号集输管线	4号集输管线	5号集输管线
管长/km	125.3	22.6	15	8.8	9.1
管径/mm	457×6.4	273×6.4	200×6.4	168.3×5.6	168.3×5.6
材质	20^#	20^#	20^#	20^#	20^#
输量/10⁴m³·d^-1	50	60	65	1.5	1.0
输送压力/MPa	3.6~4.0	3.6~4.0	1.3	0.72	0.76
初始压降/MPa	1.41	1.43	0.61	0.196	0.198
加注方式	雾化式	雾化式	雾化式	雾化式	雾化式
每次加剂总量/L	401.9	484.0	520.3	9.0	32
加剂流量/L·h^-1	4.17	5.05	5.42	0.09	0.33
每次加剂天数/d	5~6	4~5	4~5	4~5	4~5

项目	C	H	N	O
计算值/%	59.79	9.05	26.18	4.98
测试值/%	59.13	8.72	26.85	4.63

项目	C	H	N	O
计算值/%	59.79	9.05	26.18	4.98
测试值/%	59.13	8.72	26.85	4.63

项目	检测依据	结果
甲烷摩尔分数/%	GB/T13610—2020	91.16
乙烷摩尔分数/%		1.6
丙烷摩尔分数/%		0.65
异丁烷摩尔分数/%		0.16
正丁烷摩尔分数/%		0.28
新戊烷摩尔分数/%		0.00
异戊烷摩尔分数/%		0.08
正戊烷摩尔分数/%		0.09
己烷及己烷以上摩尔分数/%		0.00
氧气摩尔分数/%		0.24
氮气摩尔分数/%		5.62
二氧化碳摩尔分数/%		0.12
氦气摩尔分数/%		0.00
氢气摩尔分数/%		0.00
高位发热量（在101.325KPa，20^oC下）/MJ·m^-3	GB/T11062—2020	36.25
低位发热量（在101.325KPa，20^oC下）/MJ·m^-3		32.69
相对密度/g·cm^-3		0.6032
沃泊指数/ MJ·Sm^-3		46.67