Industrial Purity Specifications For Phenethyl Chloride

• Target ≥99% purity via fractional distillation for pharmaceutical intermediates.
• Strict moisture control and GC analysis required to prevent side reactions.
• Verify supplier capabilities through detailed COA and bulk price assessments.

In the realm of fine chemical synthesis and pharmaceutical manufacturing, the quality of starting materials dictates the success of the final output. Phenethyl chloride, identified by CAS Number 622-24-2, serves as a critical building block for numerous organic transformations. For procurement specialists and process chemists, understanding the technical specifications beyond the basic Certificate of Analysis is essential. This compound, chemically known as Benzene (2-chloroethyl)-, is a halogenated hydrocarbon that requires stringent quality control to ensure optimal reaction yields and minimize downstream purification costs.

The physical properties of this intermediate are well-documented, yet variations exist based on the refinement level. Typically appearing as a clear liquid ranging from colorless to light yellow, it possesses a molecular weight of 140.61 g/mol. The boiling point is a critical parameter for purification, recorded at 82-84 °C under 16 mm Hg vacuum. Density measurements at 25 °C usually stabilize around 1.069 g/mL. However, these physical constants are merely baseline indicators; the true value lies in the chromatographic profile and impurity spectrum.

Defining Industrial-Grade Purity Standards

When evaluating industrial purity for bulk applications, a standard specification of 99% or higher is generally required for pharmaceutical intermediates. Lower purity grades, often seen in general laboratory reagents, may contain significant levels of isomers, unreacted alcohols, or elimination byproducts such as styrene. In large-scale reactions, even trace amounts of these impurities can act as catalyst poisons or initiate polymerization side reactions.

Advanced quality control utilizes Gas Chromatography (GC) to quantify the main peak area against potential contaminants. A robust manufacturing specification should detail the limits for water content, typically requiring levels below 0.1% to prevent hydrolysis during nucleophilic substitution reactions. Furthermore, acid value testing is crucial to ensure no free hydrochloric acid remains from the chlorination step, which could corrode reactor vessels or degrade acid-sensitive substrates.

Optimization of the Manufacturing Process

The quality of the final product is intrinsically linked to the synthesis route employed. Common production methods involve the chlorination of phenethyl alcohol using thionyl chloride or hydrochloric acid. Each pathway presents distinct impurity profiles. For instance, acid-catalyzed routes may introduce higher moisture content, requiring rigorous drying phases post-synthesis. Conversely, thionyl chloride methods may leave sulfur-based residues if not properly distilled.

At NINGBO INNO PHARMCHEM CO.,LTD., the manufacturing process is optimized to maximize yield while maintaining high selectivity. Fractional distillation under reduced pressure is the standard purification technique to separate the target compound from higher boiling point oligomers and lower boiling point solvents. Continuous monitoring of the distillation cuts ensures that only the core fraction, matching the specific boiling point range, is collected for bulk packaging. This attention to detail minimizes the presence of β-elimination products, ensuring the material is suitable for sensitive coupling reactions.

Commercial Considerations and Bulk Procurement

For buyers sourcing this chemical on a metric ton scale, understanding market dynamics is as important as technical specs. The bulk price of organic intermediates fluctuates based on raw material availability, energy costs, and regulatory compliance. While small-pack pricing from laboratory suppliers can be exorbitant, establishing a direct relationship with a production facility offers significant cost advantages.

When negotiating contracts, buyers should insist on a comprehensive COA (Certificate of Analysis) for every batch. This document should not only list the purity percentage but also provide a chromatogram and specific test results for moisture, density, and refractive index. Reliability in supply chain logistics is another critical factor. Delays in shipping hazardous liquids can disrupt production schedules, making the choice of partner vital.

For laboratories and industrial plants seeking consistent quality, sourcing (2-Chloroethyl)benzene from a verified global manufacturer ensures adherence to international safety and quality standards. Partnering with a company like NINGBO INNO PHARMCHEM CO.,LTD. provides access to technical support teams capable of assisting with scale-up challenges and regulatory documentation.

Physical and Chemical Properties Overview

The following table summarizes the key technical data points required for quality assurance verification:

Parameter	Specification	Test Method
CAS Number	622-24-2	N/A
Molecular Formula	C8H9Cl	N/A
Molecular Weight	140.61 g/mol	Calculation
Appearance	Clear Liquid (Colorless to Light Yellow)	Visual
Purity (GC)	≥ 99.0%	Gas Chromatography
Boiling Point	82-84 °C @ 16 mm Hg	Distillation
Density	1.069 g/mL @ 25 °C	Pychnometer
Water Content	≤ 0.1%	Karl Fischer

Safety and Storage Protocols

Handling halogenated hydrocarbons requires strict adherence to safety protocols. The compound is classified under GHS07 with warning signals regarding flammability and skin irritation. Hazard statements typically include H227 (Combustible liquid), H315 (Causes skin irritation), and H319 (Causes serious eye irritation). Proper Personal Protective Equipment (PPE), including chemical-resistant gloves and eyeshields, is mandatory during transfer operations.

Storage conditions play a pivotal role in maintaining stability over time. The material should be kept sealed in dry conditions at room temperature to prevent moisture absorption and hydrolysis. Containers must be grounded to prevent static discharge, given the combustible nature of the liquid. Compliance with local regulations regarding combustible liquids (Storage Class 10) is required for warehouse facilities.

In conclusion, securing high-quality Phenethyl chloride involves a rigorous evaluation of technical specifications, manufacturing capabilities, and supply chain reliability. By prioritizing industrial purity standards and partnering with established producers, chemical enterprises can ensure consistent reaction outcomes and operational efficiency.