ICS 75.040 E 21 备案号:14092-2004

SY

中华人民共和国石油天然气行业标准

SY/T 7550-2004 代替SY/T 7550-2000

原油中蜡、胶质、沥青质含量测定法 Determination of wax, resins and asphaltenes contents in crude oil

2004一07一03发布

2004一11-01实施

国家发展和改革委员会 发布

sY/T 7550- 2004

目 次

• 前言·····。·····················、·················。································································。···⋯⋯n 1 范围·············································································。·································⋯⋯1 2 规范性引用文件···。············································。···············································⋯⋯1 3 术语和定义········.·································································。··················。·······⋯⋯1 4 方法概要···························································。··。··· . ······································。·⋯1 5 试剂及材料·······················。····。··································································。······⋯⋯1 6 仪器·····‘·········································································································⋯⋯2 7 准备工作·····························。··⋯， ’ ······。。·········。···、·············································⋯⋯4 8 试验步骤·····································································································。···⋯⋯4 9 计算······················。····。······。·······。··········。····，····················································⋯⋯5 10 精密度······················································································ . ····················⋯⋯6 11 报告···············································································································⋯⋯6

SY/'r 7550-2004

前 言

本标准代替SY/T 7550-2000《原油中蜡、胶质、沥青质含量测定法》。 本标准与SY/T 7550-2000相比，主要有如下变化:

— 细化7.3的蒸馏过程; — 明确使用120℃油浴蒸去甲苯溶剂; — 将“蜡含量测定器”改为“蜡含量测定仪”; — “在真空烘箱内干燥60min，称量”改为“在真空烘箱内干燥60min，冷却40min，称量至恒 重，，;

— “静止析蜡”改为“搅拌析蜡，’;

— 增加残油收率的计算公式。

本标准由油气计量及分析方法专业标准化技术委员会提出并归口。

本标准起草单位:中国石油化工集团公司管道储运公司华东管道设计研究院。 本标准主要起草人:陈红、叶烈波、李荣晖、吴怀颖。 本标准所代替标准的历次版本发布情况为:

— SY/T 7550- 2000,

SY/T 755.卜一2004

原油中蜡、胶质、沥青质含量测定法

范围

本标准规定了原油中蜡、胶质及沥青质含量的测定法。 本标准适用于水含量不超过0.5%的原油。

2 规范性引用文件

下列文件中的条款通过本标准的引用而成为本标准的条款。凡是注日期的引用文件，其随后所有 的修改单(不包括勘误的内容)或修订版均不适用于本标准，然而，鼓励根据本标准达成协议的各方 研究是否可使用这些文件的最新版本。凡是不注日期的引用文件，其最新版本适用于本标准。 GB/T 255 石油产品馏程测定法 GB/T 260 石油产品水分测定法 GB/T 2538 原油试验法 GB/T 4756 石油液体手工取样法 GB/T 8929 原油水含量测定法(蒸馏法)

3 术语和定义

下列术语和定义适用于本标准。

3.1

沥青质 asphaltenes 原油中不溶于正庚烷、溶于甲苯的组分。

3.2

胶质 resins

预处理后的原油在氧化铝色谱柱上吸附，用石油醚和甲苯冲洗时不能脱附的部分，扣除沥青质后 的组分。 3.3

蜡 Wax 氧化铝吸附色谱法得到的油蜡组分，用甲苯 丙酮<1:1)为脱蜡溶剂经冷冻结晶析出的组分。

4 方法概要

一份试样用正庚烷溶解，滤出不溶物，用正庚烷回流除去不溶物中夹杂的油蜡及胶质后，用甲苯 回流溶解沥青质，除去溶剂，求得沥青质的含量。另一份试样经氧化铝色谱柱分离出油蜡部分，再以 甲苯一丙酮混合物为脱蜡溶剂，用冷冻结晶法测定蜡含量。用减差法得到胶质含量(测定流程见图 1),

5 试剂及材料

5.1 正庚烷:分析纯。

5.2 甲苯:分析纯。

5.3 石油醚:分析纯，600C -900C .

SY/T 7550-2侧种

试样
正庚倪治解后静止沉降(瓶1) 暇化铝色谱柱吸附
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5.4 氧化铝:层析用，0. 15mm-0. 076mm (100目、衷)o目)，中性。

5.5 丙酮:分析纯。 5.6 乙醇:工业级。

6 仪器

• 6.1沥青质测定器:见图2，包括两个24号磨口锥翔粗、抽组翻舞冷舰争

• 6.2 蜡含量测定仪:见图3,滤板孔径2如- 3tamo

• 6.3 翅级恒温水浴:能控制温度波动范围士0. 5`C ,

• 6.4 电热套:。6kW-1. 8kW，功率可调。

• 6.5 油浴:可设定温度120'C o

• 6.6 水浴:0. 6kW-1. 8kW，功率可调。

• 6.7 真空烘箱:可使温度保持在105℃一110'C ,

• ‘.8 玻璃吸附柱:见图4，吸附柱外面带循环水夹套。

• ‘.，高温炉:最高温度不低于8000C ,

• 6.10 锥形瓶:100mL.